Skip to main content
Top
Published in: BMC Musculoskeletal Disorders 1/2013

Open Access 01-12-2013 | Study protocol

Study protocol title: a prospective cohort study of low back pain

Authors: Arun Garg, Kurt T Hegmann, J Steven Moore, Jay Kapellusch, Matthew S Thiese, Sruthi Boda, Parag Bhoyr, Donald Bloswick, Andrew Merryweather, Richard Sesek, Gwen Deckow-Schaefer, James Foster, Eric Wood, Xiaoming Sheng, Richard Holubkov, The BackWorks Study Team

Published in: BMC Musculoskeletal Disorders | Issue 1/2013

Login to get access

Abstract

Background

Few prospective cohort studies of workplace low back pain (LBP) with quantified job physical exposure have been performed. There are few prospective epidemiological studies for LBP occupational risk factors and reported data generally have few adjustments for many personal and psychosocial factors.

Methods/design

A multi-center prospective cohort study has been incepted to quantify risk factors for LBP and potentially develop improved methods for designing and analyzing jobs. Due to the subjectivity of LBP, six measures of LBP are captured: 1) any LBP, 2) LBP ≥ 5/10 pain rating, 3) LBP with medication use, 4) LBP with healthcare provider visits, 5) LBP necessitating modified work duties and 6) LBP with lost work time. Workers have thus far been enrolled from 30 different employment settings in 4 diverse US states and performed widely varying work. At baseline, workers undergo laptop-administered questionnaires, structured interviews, and two standardized physical examinations to ascertain demographics, medical history, psychosocial factors, hobbies and physical activities, and current musculoskeletal disorders. All workers’ jobs are individually measured for physical factors and are videotaped. Workers are followed monthly for the development of low back pain. Changes in jobs necessitate re-measure and re-videotaping of job physical factors. The lifetime cumulative incidence of low back pain will also include those with a past history of low back pain. Incident cases will exclude prevalent cases at baseline. Statistical methods planned include survival analyses and logistic regression.

Discussion

Data analysis of a prospective cohort study of low back pain is underway and has successfully enrolled over 800 workers to date.
Appendix
Available only for authorised users
Literature
1.
go back to reference Bureau of Labor Statistics U.S. Department of Labor: Nonfatal occupational injuries and illnesses requiring days away from work. 2011, Released 10:00 a.m. (EST) Thursday, November 8, 2012. USDL-12-2204 Bureau of Labor Statistics U.S. Department of Labor: Nonfatal occupational injuries and illnesses requiring days away from work. 2011, Released 10:00 a.m. (EST) Thursday, November 8, 2012. USDL-12-2204
2.
go back to reference Biering-Sorensen F: Low back trouble in a general population of 30-, 40-, 50-, and 60-year-old men and women. Study design, representativeness and basic results. Dan Med Bull. 1982, 29: 289-299.PubMed Biering-Sorensen F: Low back trouble in a general population of 30-, 40-, 50-, and 60-year-old men and women. Study design, representativeness and basic results. Dan Med Bull. 1982, 29: 289-299.PubMed
3.
go back to reference Frymoyer JW, Pope MH: Risk factors in low-back pain. An epidemiological survey. J Bone Joint Surg Am. 1983, 65: 213-218.PubMed Frymoyer JW, Pope MH: Risk factors in low-back pain. An epidemiological survey. J Bone Joint Surg Am. 1983, 65: 213-218.PubMed
4.
go back to reference Hirsch C, Jonsson B: Low-back symptoms in a Swedish female population. Clin Orthop Relat Res. 1969, 63: 171-176.PubMed Hirsch C, Jonsson B: Low-back symptoms in a Swedish female population. Clin Orthop Relat Res. 1969, 63: 171-176.PubMed
5.
go back to reference Hult L: The Munkfors investigation; a study of the frequency and causes of the stiff neck brachialgia and lumbago-sciatica syndromes, as well as observations on certain signs and symptoms from the dorsal spine and the joints of the extremities in industrial and forest workers. Acta Orthop Scand Suppl. 1954, 16: 1-76.CrossRefPubMed Hult L: The Munkfors investigation; a study of the frequency and causes of the stiff neck brachialgia and lumbago-sciatica syndromes, as well as observations on certain signs and symptoms from the dorsal spine and the joints of the extremities in industrial and forest workers. Acta Orthop Scand Suppl. 1954, 16: 1-76.CrossRefPubMed
7.
go back to reference Bernard BP: Musculoskeletal disorders and workplace factors: a critical review of epidemiologic evidence for work-related musculoskeletal disorders of the neck, upper extremity, and low back. 1997, US Department of Health and Human Services (DHHS) publication, 97-141. Cincinnati: National Institute for Occupational Safety and Health Bernard BP: Musculoskeletal disorders and workplace factors: a critical review of epidemiologic evidence for work-related musculoskeletal disorders of the neck, upper extremity, and low back. 1997, US Department of Health and Human Services (DHHS) publication, 97-141. Cincinnati: National Institute for Occupational Safety and Health
8.
go back to reference Marras WS, Ferguson SA, Burr D, Schabo P, Maronitis A: Low back pain recurrance in occupational environments. Spine (Phila Pa 1976). 2007, 32: 2387-2397. 10.1097/BRS.0b013e3181557be9.CrossRef Marras WS, Ferguson SA, Burr D, Schabo P, Maronitis A: Low back pain recurrance in occupational environments. Spine (Phila Pa 1976). 2007, 32: 2387-2397. 10.1097/BRS.0b013e3181557be9.CrossRef
9.
go back to reference Lawrence RC, Helmick CG, Arnett FC, Deyo RA, Felson DT, Giannini EH, Heyse SP, Hirsch R, Hochberg MC, Hunder GG, Liang MH, Pillemer SR, Steen VS, Wolfe F: Estimates of the prevalence of arthritis and selected musculoskeletal disorders in the united states. Arthritis Rheum. 1998, 41: 778-799. 10.1002/1529-0131(199805)41:5<778::AID-ART4>3.0.CO;2-V.CrossRefPubMed Lawrence RC, Helmick CG, Arnett FC, Deyo RA, Felson DT, Giannini EH, Heyse SP, Hirsch R, Hochberg MC, Hunder GG, Liang MH, Pillemer SR, Steen VS, Wolfe F: Estimates of the prevalence of arthritis and selected musculoskeletal disorders in the united states. Arthritis Rheum. 1998, 41: 778-799. 10.1002/1529-0131(199805)41:5<778::AID-ART4>3.0.CO;2-V.CrossRefPubMed
10.
go back to reference Bergquist-Ullman M, Larsson U: Acute low back pain in industry. A controlled prospective study with special reference to therapy and confounding factors. Acta Orthop Scand. 1977, 170: 1-117.CrossRefPubMed Bergquist-Ullman M, Larsson U: Acute low back pain in industry. A controlled prospective study with special reference to therapy and confounding factors. Acta Orthop Scand. 1977, 170: 1-117.CrossRefPubMed
11.
go back to reference Horal J: The clinical appearance of low back disorders in the city of Gothenburg, Sweden. Comparisons of incapacitated probands with matched controls. Acta Orthop Scand Suppl. 1969, 118: 1-109.CrossRefPubMed Horal J: The clinical appearance of low back disorders in the city of Gothenburg, Sweden. Comparisons of incapacitated probands with matched controls. Acta Orthop Scand Suppl. 1969, 118: 1-109.CrossRefPubMed
12.
go back to reference Andersson G: Low back pain in industry: epidemiological aspects. Scand J Rehabil Med. 1979, 11: 163-168.PubMed Andersson G: Low back pain in industry: epidemiological aspects. Scand J Rehabil Med. 1979, 11: 163-168.PubMed
13.
go back to reference Taylor DG: The costs of arthritis and the benefits of joint replacement surgery. Proc R Soc Lond B Biol Sci. 1976, 192: 145-155. 10.1098/rspb.1976.0002.CrossRefPubMed Taylor DG: The costs of arthritis and the benefits of joint replacement surgery. Proc R Soc Lond B Biol Sci. 1976, 192: 145-155. 10.1098/rspb.1976.0002.CrossRefPubMed
14.
go back to reference Andersson GB: Epidemiologic aspects on low-back pain in industry. Spine. 1981, 6: 53-60. 10.1097/00007632-198101000-00013.CrossRefPubMed Andersson GB: Epidemiologic aspects on low-back pain in industry. Spine. 1981, 6: 53-60. 10.1097/00007632-198101000-00013.CrossRefPubMed
15.
go back to reference Snook SH: Low back pain in industry, Symposium on Idiopathic Low Back Pain. 1982, CV Mosby Company, 23- Snook SH: Low back pain in industry, Symposium on Idiopathic Low Back Pain. 1982, CV Mosby Company, 23-
16.
go back to reference Webster BS, Snook SH: The cost of compensable upper extremity cumulative trauma disorders. J Occup Med. 1994, 36: 713-717.PubMed Webster BS, Snook SH: The cost of compensable upper extremity cumulative trauma disorders. J Occup Med. 1994, 36: 713-717.PubMed
17.
go back to reference Garg A, Owen B, Beller D, Banaag J: A biomechanical and ergonomic evaluation of patient transferring tasks: bed to wheelchair and wheelchair to bed. Ergonomics. 1991, 34: 289-312. 10.1080/00140139108967314.CrossRefPubMed Garg A, Owen B, Beller D, Banaag J: A biomechanical and ergonomic evaluation of patient transferring tasks: bed to wheelchair and wheelchair to bed. Ergonomics. 1991, 34: 289-312. 10.1080/00140139108967314.CrossRefPubMed
18.
go back to reference Garg A, Owen B: Reducing back stress to nursing personnel: an ergonomic intervention in a nursing home. Ergonomics. 1992, 35: 1353-1375. 10.1080/00140139208967398.CrossRefPubMed Garg A, Owen B: Reducing back stress to nursing personnel: an ergonomic intervention in a nursing home. Ergonomics. 1992, 35: 1353-1375. 10.1080/00140139208967398.CrossRefPubMed
19.
go back to reference Herrin GD, Jaraiedi M: Prediction of overexertion injuries using biomechanical and psychophysical models. Am Ind Hyg Assoc J. 1986, 47: 322-330. 10.1080/15298668691389829.CrossRefPubMed Herrin GD, Jaraiedi M: Prediction of overexertion injuries using biomechanical and psychophysical models. Am Ind Hyg Assoc J. 1986, 47: 322-330. 10.1080/15298668691389829.CrossRefPubMed
20.
go back to reference Jensen RC: Disabling back injuries among nursing personnel: research needs and justification. Res Nurs Health. 1987, 10: 29-38. 10.1002/nur.4770100106.CrossRefPubMed Jensen RC: Disabling back injuries among nursing personnel: research needs and justification. Res Nurs Health. 1987, 10: 29-38. 10.1002/nur.4770100106.CrossRefPubMed
21.
go back to reference Klein BP, Jensen RC: Assessment of workers’ compensation claims for back strains/sprains. J Occup Med. 1984, 26: 443-448. 10.1097/00043764-198406000-00017.CrossRefPubMed Klein BP, Jensen RC: Assessment of workers’ compensation claims for back strains/sprains. J Occup Med. 1984, 26: 443-448. 10.1097/00043764-198406000-00017.CrossRefPubMed
22.
go back to reference Tabor M: Reconstructing the scene: back injury. Occup Health Saf. 1982, 51: 16-22.PubMed Tabor M: Reconstructing the scene: back injury. Occup Health Saf. 1982, 51: 16-22.PubMed
23.
go back to reference White AA, Gordon SL: Synopsis: workshop on idiopathic low-back pain. Spine (Phila Pa 1976). 1982, 7: 141-149. 10.1097/00007632-198203000-00009.CrossRef White AA, Gordon SL: Synopsis: workshop on idiopathic low-back pain. Spine (Phila Pa 1976). 1982, 7: 141-149. 10.1097/00007632-198203000-00009.CrossRef
24.
go back to reference Hoogendoorn WE, Bongers PM: High physical work load and low job satisfaction increase the risk of sickness absence due to low back pain: results of a prospective cohort study. Occup Environ Med. 2002, 59: 323-328. 10.1136/oem.59.5.323.CrossRefPubMedPubMedCentral Hoogendoorn WE, Bongers PM: High physical work load and low job satisfaction increase the risk of sickness absence due to low back pain: results of a prospective cohort study. Occup Environ Med. 2002, 59: 323-328. 10.1136/oem.59.5.323.CrossRefPubMedPubMedCentral
25.
go back to reference Bernard B: Musculoskeletal disorders and workplace factors: A critical review of epidemiologic evidence for work related musculoskeletal disorders of the neck, upper extremity, and low back. 1997, U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, No. 97–141. 1997. Bernard B: Musculoskeletal disorders and workplace factors: A critical review of epidemiologic evidence for work related musculoskeletal disorders of the neck, upper extremity, and low back. 1997, U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, No. 97–141. 1997.
26.
go back to reference Waters TR, Putz-Anderson V: Revised NIOSH equation for the design and evaluation of manual lifting tasks. Ergonomics. 1993, 36: 749-776. 10.1080/00140139308967940.CrossRefPubMed Waters TR, Putz-Anderson V: Revised NIOSH equation for the design and evaluation of manual lifting tasks. Ergonomics. 1993, 36: 749-776. 10.1080/00140139308967940.CrossRefPubMed
27.
go back to reference Waters TR, Putz-Anderson V, Garg A: Applications manual for the revised NIOSH lifting equation. 1994, Cincinnati, Ohio: US Department of Health and Human Services Waters TR, Putz-Anderson V, Garg A: Applications manual for the revised NIOSH lifting equation. 1994, Cincinnati, Ohio: US Department of Health and Human Services
28.
go back to reference Snook SH, Ciriello VM: The design of manual handling tasks: revised tables of maximum acceptable weights and forces. Ergonomics. 1991, 34: 1197-10.1080/00140139108964855.CrossRefPubMed Snook SH, Ciriello VM: The design of manual handling tasks: revised tables of maximum acceptable weights and forces. Ergonomics. 1991, 34: 1197-10.1080/00140139108964855.CrossRefPubMed
29.
go back to reference Garg A, Chaffin DB: Prediction of metabolic rates for manual materials handling jobs. Am Ind Hyg Assoc J. 1978, 39: 661-674. 10.1080/0002889778507831.CrossRefPubMed Garg A, Chaffin DB: Prediction of metabolic rates for manual materials handling jobs. Am Ind Hyg Assoc J. 1978, 39: 661-674. 10.1080/0002889778507831.CrossRefPubMed
30.
go back to reference Garg A, Chaffin DB: A biomechanical computerized simulation of human strength. AIIE Transactions. 1975, 7: 01-15. 10.1080/05695557508974978.CrossRef Garg A, Chaffin DB: A biomechanical computerized simulation of human strength. AIIE Transactions. 1975, 7: 01-15. 10.1080/05695557508974978.CrossRef
31.
go back to reference Ayoub MM, Bassoussi ME: In Proceedings of the Human Factors and Ergonomics Society Annual Meeting. Dynamic biomechanical model for sagittal lifting activities. 1976, SAGE Publications, Vol. 20, No. 16, pp. 355-361 Ayoub MM, Bassoussi ME: In Proceedings of the Human Factors and Ergonomics Society Annual Meeting. Dynamic biomechanical model for sagittal lifting activities. 1976, SAGE Publications, Vol. 20, No. 16, pp. 355-361
32.
go back to reference Bean JC, Chaffin BB: Biomechanical model calculation of muscle contraction forces: a double linear programming method. J Biomech. 1988, 21: 59-10.1016/0021-9290(88)90192-3.CrossRefPubMed Bean JC, Chaffin BB: Biomechanical model calculation of muscle contraction forces: a double linear programming method. J Biomech. 1988, 21: 59-10.1016/0021-9290(88)90192-3.CrossRefPubMed
33.
go back to reference Leskinen TP, Stalhammar HR: A dynamic analysis of spinal compression with different lifting techniques. Ergonomics. 1983, 26: 595-604. 10.1080/00140138308963378.CrossRefPubMed Leskinen TP, Stalhammar HR: A dynamic analysis of spinal compression with different lifting techniques. Ergonomics. 1983, 26: 595-604. 10.1080/00140138308963378.CrossRefPubMed
34.
go back to reference Marras WS, Sommerich CM: A three-dimensional motion model of loads on the lumbar spine: I. Model structure. Hum Factors. 1991, 33: 123-137.PubMed Marras WS, Sommerich CM: A three-dimensional motion model of loads on the lumbar spine: I. Model structure. Hum Factors. 1991, 33: 123-137.PubMed
35.
go back to reference McGill SM, Norman RW: Partitioning of the L4-L5 dynamic moment into disc, ligamentous, and muscular components during lifting. Spine (Phila Pa 1976). 1986, 11: 666-678. 10.1097/00007632-198609000-00004.CrossRef McGill SM, Norman RW: Partitioning of the L4-L5 dynamic moment into disc, ligamentous, and muscular components during lifting. Spine (Phila Pa 1976). 1986, 11: 666-678. 10.1097/00007632-198609000-00004.CrossRef
36.
go back to reference Garg A: An evaluation of the NIOSH guidelines for manual lifting, with special reference to horizontal distance. Am Ind Hyg Assoc J. 1989, 50: 157-164. 10.1080/15298668991374453.CrossRefPubMed Garg A: An evaluation of the NIOSH guidelines for manual lifting, with special reference to horizontal distance. Am Ind Hyg Assoc J. 1989, 50: 157-164. 10.1080/15298668991374453.CrossRefPubMed
37.
go back to reference Garg A, Hagglund G: A physiological evaluation of time standards for warehouse operations as Set by traditional work measurement techniques. Transactions of the Institute of Industrial Engineers. 1986, 18: 235- Garg A, Hagglund G: A physiological evaluation of time standards for warehouse operations as Set by traditional work measurement techniques. Transactions of the Institute of Industrial Engineers. 1986, 18: 235-
38.
go back to reference Waters TR, Putz-Anderson V: Methods for assessing the physical demands of manual lifting: a review and case study from warehousing. Am Ind Hyg Assoc J. 1998, 59: 871-881. 10.1080/15428119891011045.CrossRefPubMed Waters TR, Putz-Anderson V: Methods for assessing the physical demands of manual lifting: a review and case study from warehousing. Am Ind Hyg Assoc J. 1998, 59: 871-881. 10.1080/15428119891011045.CrossRefPubMed
39.
go back to reference Marras WS, Lavender SA: The role of dynamic three-dimensional trunk motion in occupationally-related low back disorders. The effects of workplace factors, trunk position, and trunk motion characteristics on risk of injury. Spine (Phila Pa 1976). 1993, 18: 617-628. 10.1097/00007632-199304000-00015.CrossRef Marras WS, Lavender SA: The role of dynamic three-dimensional trunk motion in occupationally-related low back disorders. The effects of workplace factors, trunk position, and trunk motion characteristics on risk of injury. Spine (Phila Pa 1976). 1993, 18: 617-628. 10.1097/00007632-199304000-00015.CrossRef
40.
go back to reference Snook SH: The design of manual handling tasks. Ergonomics. 1978, 21: 963-985. 10.1080/00140137808931804.CrossRefPubMed Snook SH: The design of manual handling tasks. Ergonomics. 1978, 21: 963-985. 10.1080/00140137808931804.CrossRefPubMed
41.
go back to reference Ayoub MM, Selan JL: An ergonomics approach for the design of manual materials-handling tasks. Hum Factors. 1983, 25: 507-515.PubMed Ayoub MM, Selan JL: An ergonomics approach for the design of manual materials-handling tasks. Hum Factors. 1983, 25: 507-515.PubMed
42.
go back to reference Liles DH, Deivanayagam D: A job severity index for the evaluation and control of lifting injury. Hum Factors. 1984, 26: 683-693.PubMed Liles DH, Deivanayagam D: A job severity index for the evaluation and control of lifting injury. Hum Factors. 1984, 26: 683-693.PubMed
43.
go back to reference Marras WS, Parnianpour M: The classification of anatomic- and symptom-based low back disorders using motion measure models. Spine (Phila Pa 1976). 1995, 20: 2531-2546. 10.1097/00007632-199512000-00013.CrossRef Marras WS, Parnianpour M: The classification of anatomic- and symptom-based low back disorders using motion measure models. Spine (Phila Pa 1976). 1995, 20: 2531-2546. 10.1097/00007632-199512000-00013.CrossRef
44.
go back to reference Wang JL, Parnianpour M: The dynamic response of L(2)/L(3) motion segment in cyclic axial compressive loading. Clin Biomech (Bristol, Avon). 1998, 13 (Suppl 1): S16-S25.CrossRef Wang JL, Parnianpour M: The dynamic response of L(2)/L(3) motion segment in cyclic axial compressive loading. Clin Biomech (Bristol, Avon). 1998, 13 (Suppl 1): S16-S25.CrossRef
45.
go back to reference Chung SS, Lee CS: Effect of low back posture on the morphology of the spinal canal. Skeletal Radiol. 2000, 29: 217-223. 10.1007/s002560050596.CrossRefPubMed Chung SS, Lee CS: Effect of low back posture on the morphology of the spinal canal. Skeletal Radiol. 2000, 29: 217-223. 10.1007/s002560050596.CrossRefPubMed
46.
go back to reference Boda SV: Validation of Revised NIOSH Lifting Equation and 3D SSP Model to Predict Risk of Work-Related Low Back Pain. Proceedings of the Human Factors and Ergonomics Society Annual Meeting September 2010. Edited by: Boda SV, Bhoyar P, Garg A. 2010, 1185-1189. Volume 54 Boda SV: Validation of Revised NIOSH Lifting Equation and 3D SSP Model to Predict Risk of Work-Related Low Back Pain. Proceedings of the Human Factors and Ergonomics Society Annual Meeting September 2010. Edited by: Boda SV, Bhoyar P, Garg A. 2010, 1185-1189. Volume 54
47.
go back to reference ACOEM: Occupational Medicine Practice Guidelines: Evaluation and Management of Common Health Problems and Functional Recovery of Workers. Edited by: Hegmann KT. 2010, Beverly Farms: OEM Press, 3 ACOEM: Occupational Medicine Practice Guidelines: Evaluation and Management of Common Health Problems and Functional Recovery of Workers. Edited by: Hegmann KT. 2010, Beverly Farms: OEM Press, 3
48.
go back to reference SAS Institute Inc: SAS/STAT® 9.3 User’s Guide. The Varclus Procedure. 2011, Cary, NC: SAS Institute Inc SAS Institute Inc: SAS/STAT® 9.3 User’s Guide. The Varclus Procedure. 2011, Cary, NC: SAS Institute Inc
49.
go back to reference Borg GA: Psychophysical bases of perceived exertion. Med Sci Sports Exerc. 1982, 14: 377-381.PubMed Borg GA: Psychophysical bases of perceived exertion. Med Sci Sports Exerc. 1982, 14: 377-381.PubMed
50.
go back to reference Frazer MB, Norman RW: The effects of job rotation on the risk of reporting low back pain. Ergonomics. 2003, 46: 904-919. 10.1080/001401303000090161.CrossRefPubMed Frazer MB, Norman RW: The effects of job rotation on the risk of reporting low back pain. Ergonomics. 2003, 46: 904-919. 10.1080/001401303000090161.CrossRefPubMed
51.
go back to reference Mirka GA, Kelaher DP: Continuous assessment of back stress (CABS): a new method to quantify low-back stress in jobs with variable biomechanical demands. Hum Factors. 2000, 42: 209-225. 10.1518/001872000779656525.CrossRefPubMed Mirka GA, Kelaher DP: Continuous assessment of back stress (CABS): a new method to quantify low-back stress in jobs with variable biomechanical demands. Hum Factors. 2000, 42: 209-225. 10.1518/001872000779656525.CrossRefPubMed
52.
go back to reference Chen JC, Chang WR: Predictors of whole-body vibration levels among urban taxi drivers. Ergonomics. 2003, 46: 1075-1090. 10.1080/0014013031000109205.CrossRefPubMed Chen JC, Chang WR: Predictors of whole-body vibration levels among urban taxi drivers. Ergonomics. 2003, 46: 1075-1090. 10.1080/0014013031000109205.CrossRefPubMed
53.
go back to reference Funakoshi M, Taoda K: Measurement of whole-body vibration in taxi drivers. J Occup Health. 2004, 46 (2): 119-124. 10.1539/joh.46.119.CrossRefPubMed Funakoshi M, Taoda K: Measurement of whole-body vibration in taxi drivers. J Occup Health. 2004, 46 (2): 119-124. 10.1539/joh.46.119.CrossRefPubMed
54.
go back to reference Norman R, Wells R: A comparison of peak vs cumulative physical work exposure risk factors for the reporting of low back pain in the automotive industry. Clin Biomech (Bristol, Avon). 1998, 13: 561-573. 10.1016/S0268-0033(98)00020-5.CrossRef Norman R, Wells R: A comparison of peak vs cumulative physical work exposure risk factors for the reporting of low back pain in the automotive industry. Clin Biomech (Bristol, Avon). 1998, 13: 561-573. 10.1016/S0268-0033(98)00020-5.CrossRef
56.
go back to reference Dempsey PG, Hashemi L: Analysis of workers’ compensation claims associated with manual materials handling. Ergonomics. 1999, 42: 183-195. 10.1080/001401399185883.CrossRefPubMed Dempsey PG, Hashemi L: Analysis of workers’ compensation claims associated with manual materials handling. Ergonomics. 1999, 42: 183-195. 10.1080/001401399185883.CrossRefPubMed
57.
go back to reference Garg A, Hegmann KT: Short-cycle overhead work and shoulder girdle muscle fatigue. Int J Ind Ergon. 2006, 36: 581-597. 10.1016/j.ergon.2006.02.002.CrossRef Garg A, Hegmann KT: Short-cycle overhead work and shoulder girdle muscle fatigue. Int J Ind Ergon. 2006, 36: 581-597. 10.1016/j.ergon.2006.02.002.CrossRef
58.
go back to reference Garg A, Kapellusch JM: Applications of biomechanics for prevention of work-related musculoskeletal disorders. Ergonomics. 2009, 52: 36-59. 10.1080/00140130802480794.CrossRefPubMed Garg A, Kapellusch JM: Applications of biomechanics for prevention of work-related musculoskeletal disorders. Ergonomics. 2009, 52: 36-59. 10.1080/00140130802480794.CrossRefPubMed
59.
go back to reference Turnbull BW: The empirical distribution function with arbitrarily grouped, censored and truncated data. J R Stat Soc. 1976, 38: 290-295. Series B Turnbull BW: The empirical distribution function with arbitrarily grouped, censored and truncated data. J R Stat Soc. 1976, 38: 290-295. Series B
60.
go back to reference Harrell F: Regression Modeling Strategies: With applications to linear models, logistic regression and survivial anaysis. 2001, New York: SpringerCrossRef Harrell F: Regression Modeling Strategies: With applications to linear models, logistic regression and survivial anaysis. 2001, New York: SpringerCrossRef
61.
go back to reference Therneau TM, Grambsch PM: Modeling Survival Data: Extending the Cox Model. 2000, New York: SpringerCrossRef Therneau TM, Grambsch PM: Modeling Survival Data: Extending the Cox Model. 2000, New York: SpringerCrossRef
62.
go back to reference Moore JS, Garg A: The Strain Index: a proposed method to analyze jobs for risk of distal upper extremity disorders. Am Ind Hyg Assoc J. 1995, 56: 443-458. 10.1080/15428119591016863.CrossRefPubMed Moore JS, Garg A: The Strain Index: a proposed method to analyze jobs for risk of distal upper extremity disorders. Am Ind Hyg Assoc J. 1995, 56: 443-458. 10.1080/15428119591016863.CrossRefPubMed
63.
go back to reference Moore JS, Rucker NP, Knox K: Validity of generic risk factors and the strain index for predicting nontraumatic distal upper extremity morbidity. Aihaj. 2001, 62: 229-235.PubMed Moore JS, Rucker NP, Knox K: Validity of generic risk factors and the strain index for predicting nontraumatic distal upper extremity morbidity. Aihaj. 2001, 62: 229-235.PubMed
64.
go back to reference Breiman L: Classification and Regression Trees. 1984, Belmont: Wadsworth International Group Breiman L: Classification and Regression Trees. 1984, Belmont: Wadsworth International Group
65.
go back to reference Cox DR: Regression models and life tables. JR Stat Soc B. 1972, 34: 187-222. Cox DR: Regression models and life tables. JR Stat Soc B. 1972, 34: 187-222.
66.
go back to reference Andersen PK, Gill RD: Cox’s Regression model for counting processes: a large sample study. Ann Stat. 1982, 10: 1100-1120. 10.1214/aos/1176345976.CrossRef Andersen PK, Gill RD: Cox’s Regression model for counting processes: a large sample study. Ann Stat. 1982, 10: 1100-1120. 10.1214/aos/1176345976.CrossRef
67.
go back to reference Lee EW, Wei LJ, Amato D: Cox-Type Regression Analysis for Large Numbers of Small Groups of Correlated Failure Time Observations. 1992, Netherlands: Kluwer Academic, 237-247. Lee EW, Wei LJ, Amato D: Cox-Type Regression Analysis for Large Numbers of Small Groups of Correlated Failure Time Observations. 1992, Netherlands: Kluwer Academic, 237-247.
68.
go back to reference Grambsch PM, Therneau TM: Proportional hazards tests and diagnostics based on weighted residuals. Biometrika. 1994, 81: 515-526. 10.1093/biomet/81.3.515.CrossRef Grambsch PM, Therneau TM: Proportional hazards tests and diagnostics based on weighted residuals. Biometrika. 1994, 81: 515-526. 10.1093/biomet/81.3.515.CrossRef
69.
go back to reference Cook RJ, Farewell VT: Multiplicity considerations in the design and analysis of clinical trials. J R Stat Soc. 1996, 159: 93-110. 10.2307/2983471. Series ACrossRef Cook RJ, Farewell VT: Multiplicity considerations in the design and analysis of clinical trials. J R Stat Soc. 1996, 159: 93-110. 10.2307/2983471. Series ACrossRef
70.
go back to reference Schafer JL: Multiple imputation: a primer. Stat Methods Med Res. 1999, 8: 3-15. 10.1191/096228099671525676.CrossRefPubMed Schafer JL: Multiple imputation: a primer. Stat Methods Med Res. 1999, 8: 3-15. 10.1191/096228099671525676.CrossRefPubMed
71.
go back to reference Van Buuren S, Brand L, Groothuis-Oudshoorn CGM, Rubin D: Fully conditional specification in multivariate imputation. J Stat Comput Simul. 2006, 12: 1049-1064.CrossRef Van Buuren S, Brand L, Groothuis-Oudshoorn CGM, Rubin D: Fully conditional specification in multivariate imputation. J Stat Comput Simul. 2006, 12: 1049-1064.CrossRef
Metadata
Title
Study protocol title: a prospective cohort study of low back pain
Authors
Arun Garg
Kurt T Hegmann
J Steven Moore
Jay Kapellusch
Matthew S Thiese
Sruthi Boda
Parag Bhoyr
Donald Bloswick
Andrew Merryweather
Richard Sesek
Gwen Deckow-Schaefer
James Foster
Eric Wood
Xiaoming Sheng
Richard Holubkov
The BackWorks Study Team
Publication date
01-12-2013
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2013
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/1471-2474-14-84

Other articles of this Issue 1/2013

BMC Musculoskeletal Disorders 1/2013 Go to the issue