Validation of the historical adulthood physical activity questionnaire (HAPAQ) against objective measurements of physical activity

Table 1 Characteristics and physical activity measurements of participants recruited to the HAPAQ validation study

	Period 1 (1994 - 1996)		Period 2 (2000 - 2002)		Period comparison*
	Median	IQR	Median	IQR	P value
BMI (kg/m²)	25.3	4.2	26.0	4.8	0.31
Objective measurements PA:
Proportion time spent in VPA (%)	0.6	2.2	0.7	2.5	0.15
Total PAEE (kJ/min)	5.8	3.6	7.3	5.9	< 0.0001
HAPAQ- derived measures PA:
Proportion time spent in VPA (%)	0.0	1.3	0.0	1.3	0.27
PAEE at home (kJ/min)	0.5	0.4	0.5	0.4	0.25
PAEE at work (kJ/min)	2.1	2.1	1.6	1.9	0.0002
PAEE for transportation (kJ/min)	0.0	0.1	0.0	0.1	0.11
PAEE for sport (kJ/min)	0.0	0.1	0.0	0.1	0.96
PAEE for exercise (kJ/min)	0.5	0.7	0.5	0.8	0.22
Total reported PAEE (kJ/min)	3.1	3.0	2.7	2.5	0.0003
Proportion retired (%)	12%		28%		< 0.0001

* Paired t-test used for continuous variables and McNemar's test used for categorical variables
BMI: Body mass index
VPA: Vigorous Physical Activity
PAEE: Physical Activity Energy Expenditure
IQR: Interquartile range

ISSN: 1479-5868