Adaptation of the Global Physical Activity Questionnaire (GPAQ) into Turkish: A validation and reliability study

Objectives: The aim of this study was to adapt the World Health Organization’s (WHO) Global Physical Activity Questionnaire (GPAQ) into Turkish and evaluate its reliability and validity among Bornova Municipality employees. Patients and methods: The questionnaire was given its final Turkish form after its translation by two independent translators, a consensus meeting with both translators and the revision of the back-translation. An expert panel was organized for face validity and expert opinions were collected for content validity. The data of the study were collected in Municipality of Bornova district, Izmir province of Turkey between August 2016 and November 2016. Test-retest was used for reliability, International Physical Activity Questionnaire (IPAQ) was used for concurrent validity, and a pedometer was used for criterion validity. Among a total of 2,137 workers, a sample size of 352 employees was determined using 33% prevalence with 5% error margin, 95% confidence interval, and 20% non-response rate. The participants were selected with systematic sampling and 287 (81.5%) workers (183 males, 104 females; mean age: 38.9±8.5 years; range, 22 to 63 years) participated in the study. Results: Reliability coefficients were substantial, near perfect (Kappa 0.74-0.87, p