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Table 1 Respondent characteristics of the study sample and the validation sub sample.

From: Distinguishing four components underlying physical activity: a new approach to using physical activity questionnaire data in old age

Characteristics Sub sample (N = 418) Total sample (N = 1699)
Age (years, SD) 78 (6.1) 73 (8.0)
Gender (% female) 54 54
Education (%)   
   Primary 37 38
   Secondary 53 50
   College/University 10 13
BMI (kg/m2, SD) 27.2 (4.1) 27.5 (4.2)
Quadriceps strength (N, SD) 146 (40) -
Handgrip strength (kgf, SD) 27.9 (10.2) 25.6 (10.6)
Physical activity (min/day, SD) 155 (117) 157 (102)