Table 2

Validity of HAPAQ: HAPAQ-derived physical activity measurements, Spearman and intraclass correlations with objective physical activity measurements and the median biases from agreeement analysis

HAPAQ-derived measurements

Spearman correlation

Intraclass correlation coefficient^c

HAPAQ biases

Median

IQR

Median

IQR

Proportion time spent in VPA (%)

0.01

1.32

0.40***

0.24**

-0.26

1.59

Total reported PAEE (kJ/min)^a

2.91

2.66

0.44***

0.01

-2.80

4.24

Total reported PAEE (kJ/min)^b

5.90

2.28

0.48***

0.39***

-0.16

3.50

* P < 0.05

** P < 0.01

*** P < 0.0001

VPA: Vigorous physical activity

PAEE: Physical activity energy expenditure

IQR: Interquartile range

^aexcluding housework from PAEE

^bas per ^a with remaining time designated as light activity (MET 1.5)

^cVariables were log-transformed

Besson et al. International Journal of Behavioral Nutrition and Physical Activity 2010 7:54   doi:10.1186/1479-5868-7-54