Table 5

Reliability and validity estimates for physical activity and media environment items from the HHS

Reliability
 Validity

n
 % Agree
 Kappa (95% CI)
 PABAK1
 Ppos
 Pneg
 n
 % Agree
 Kappa (95% CI)
 PABAK1
 SEN
 SPEC
Physical activity environment











Outdoor recreation facilities
 45
 91.1
 0.66 (0.36–0.97)
0.95
 0.71





Indoor recreation centers
 45
 95.6
 0.88 (0.72–1.00)
0.91
 0.97





Parent exercise (past month)
 45
 95.6
 0.73 (0.36–1.00)
0.98
 0.75





Yard
 45
 100.0
 1.00
 1.00
 1.00
 1.00
 79
 98.7
 0.85 (0.56–1.00)
 0.98
 1.00
 0.75
Yard Size
 43
 83.7
 0.73 (0.54–0.92)w


75
 66.7
 0.49 (0.31–0.66)w


Share Yard
 43
 97.7
 0.85 (0.55–1.00)
 0.95
 0.86
 0.99
 75
 96.0
 0.71 (0.40–1.00)
 0.92
 1.00
 0.96
Play equipment in Yard
 43
 95.4
 0.90 (0.78–1.00)
0.94
 0.96
 74
 90.5
 0.81 (0.67–0.94)
0.98
 0.82
Bike or riding toy
 45
 91.1
 0.29 (-0.21–0.79)
 0.82
 0.95
 0.33
 78
 96.2
 -0.02 (-0.04–0.01)
 0.92
 0.99
 0.00
Adequate Play Space Inside
 45
 77.8
 0.69 (0.50–0.89)w


79
 43.0
 0.06 (-0.11–0.22)w


Media environment











Number of TVs
 45
 100.0
 1.00w


78
 84.6
 0.88 (0.82–0.95)w


Number of DVD players
 45
 75.6
 0.77 (0.64–0.90)w


79
 59.5
 0.56 (0.43–0.70)w


Number of computers
 45
 93.3
 0.92 (0.84–1.00)w


79
 64.6
 0.58 (0.45–0.72)w


Number of video games consoles
 45
 88.9
 0.84 (0.73–0.95)w


79
 73.4
 0.64 (0.55–0.74)w


Number of DVDs
 44
 75.0
 0.56 (0.33–0.80)w


79
 64.6
 0.60 (0.46–0.75)w


Cable TV
 45
 100.0
 1.00
1.00
 1.00
 79
 98.7
 0.96 (0.89–1.00)
1.00
 0.94
TV in child's bedroom
 45
 100.0
 1.00
1.00
 1.00
 79
 96.2
 0.88 (0.75–1.00)
0.88
 0.99
Computer in child's bedroom
 45
 100.0
 1.00
 1.00
 1.00
 1.00
 79
 92.4
 0.53 (0.21–0.86)
 0.85
 0.44
 0.99
Video game in child's bedroom
 42
 97.6
 0.84 (0.55–1.00)
 0.95
 0.86
 0.99
 76
 94.7
 0.72 (0.47–0.98)
 0.90
 0.60
 1.00

wWeighted Kappa (for items with ≥3 response categories); 1 Adjusted Kappa (PABAK) used if prevalence ≥85%; Ppos = proportion of positive agreement; Pneg = proportion of negative agreement; SEN = sensitivity (proportion of those reporting YES confirmed as YES by the home visit); SPE = specificity (proportion of those reporting NO confirmed as NO by the home visit); CI = confidence interval

Bryant et al. International Journal of Behavioral Nutrition and Physical Activity 2008 5:23   doi:10.1186/1479-5868-5-23