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Validity and repeatability of a modified Baecke questionnaire on physical activity

M A Pols¹, P H Peeters, H B Bueno-De-Mesquita

¹Department of Epidemiology, Faculty of Medicine, University of Utrecht, The Netherlands.

International Journal of Epidemiology

|April 1, 1995

Summary

The modified Baecke physical activity questionnaire shows good repeatability and moderate validity when compared to activity diaries. This physical activity assessment tool is more accurate for men than for women.

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Area of Science:

Epidemiology
Public Health
Nutritional Science

Background:

Pilot study for the European Prospective Investigation into Cancer and Nutrition (EPIC).
Assessed a modified Baecke questionnaire for physical activity.
Included 134 men and women aged 20-70 years.

Purpose of the Study:

Evaluate the repeatability of the modified Baecke questionnaire.
Determine the relative validity of the questionnaire against activity diaries.
Assess the questionnaire's performance in men and women.

Main Methods:

Repeatability assessed using Pearson's correlation coefficients and percentage agreement in tertiles.
Relative validity compared questionnaire data to a four-time repeated 3-day activity diary.

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Analyses conducted at baseline, 5 months, and 11 months.

Main Results:

Good repeatability observed with test-retest correlation coefficients ranging from 0.65 to 0.89.
Relative validity correlations were 0.56 for men and 0.44 for women.
Agreement beyond chance was higher in men (57-56%) than women (41-46%) for repeatability.

Conclusions:

The modified Baecke questionnaire demonstrates good repeatability and moderate relative validity.
The physical activity questionnaire is more valid in men compared to women.
Findings are consistent with values reported in similar validation studies.