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BMC Primary Care
Published in: BMC Primary Care 1/2010

Open Access 01-12-2010 | Research article

Validation of the "SmoCess-GP" instrument - a short patient questionnaire for assessing the smoking cessation activities of general practitioners: a cross-sectional study

Authors: Julia Jung, Melanie Neumann, Markus Wirtz, Nicole Ernstmann, Andrea Staratschek-Jox, Jürgen Wolf, Holger Pfaff

Published in: BMC Primary Care | Issue 1/2010

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Abstract

Background

We developed an instrument assessing the extent of smoking cessation activities by general practitioners (GPs) within the Cologne Smoking Study (CoSmoS). The objective of the present study was to examine further psychometric quality of the "SmoCess-GP" instrument (Smoking Cessation by General Practitioners).

Methods

127 current smokers who had participated in the Cologne Smoking Study (CoSmoS) were included in our analyses. Confirmatory factor analysis (CFA) was conducted to examine the model fit and to retest the single-factor structure of the instrument using the Mplus software. Further construct validity was tested with bivariate analysis using an instrument which measures patients' trust in physicians.

Results

CFA supported the unidimensional structure of the instrument. The factor loadings exceed the threshold of ≥ 0.50. All indicator reliabilities were higher than 0.30. The composite reliability was 0.86 and the average variance extracted (AVE) resulted in a value of 0.50. The calculation of global fit indices identified a CFI value of 1.00 and for TLI a value of 1.02. The root mean square error of approximation (RMSEA) indicates that 0% of the information is not accounted for by the model. The chi-square value was χ2 df = 6 = 4.63 (p = 0.59). Analysis of discriminant validity resulted in a non-significiant correlation of r = 0.092 (p = 0.350).

Conclusions

Results indicate preliminary evidence for the construct validity of the "SmoCess-GP" instrument which therefore appears to be a promising tool for analyzing the extent of smoking cessation advice offered by GPs from the patients' perspective. Future research should examine the psychometric properties in a population based sample, further improvements of the instrument and should apply other methods of validation.
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Metadata
Title
Validation of the "SmoCess-GP" instrument - a short patient questionnaire for assessing the smoking cessation activities of general practitioners: a cross-sectional study
Authors
Julia Jung
Melanie Neumann
Markus Wirtz
Nicole Ernstmann
Andrea Staratschek-Jox
Jürgen Wolf
Holger Pfaff
Publication date
01-12-2010
Publisher
BioMed Central
Published in
BMC Primary Care / Issue 1/2010
Electronic ISSN: 2731-4553
DOI
https://doi.org/10.1186/1471-2296-11-9

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