Table 4.

Kappa statistics and 95% confidence intervals (CI) of the physical activity components measures overall and among women who reported recreational activity in the WHI Measurement and Precision Study

	Entire sample			Women with ≥1 episode of recreational activity#
	N	Weighted Kappa	95% CI	N	Weighted Kappa	95% CI
Form 34: Exercise or recreational physical activity
Mild physical activity, days per week	548	0.36	0.27, 0.45	303	0.40	0.28, 0.51
Mild physical activity, minutes per session	528	0.52	0.43, 0.61	295	0.51	0.40, 0.62
Moderate physical activity, days per week	563	0.53	0.47, 0.59	314	0.54	0.47, 0.47
Moderate physical activity, minutes per session	544	0.48	0.41, 0.54	297	0.44	0.36, 0.53
Strenuous physical activity, days per week	555	0.62	0.55, 0.68	314	0.62	0.55, 0.69
Strenuous physical activity, minutes per session	546	0.61	0.54, 0.68	306	0.60	0.52, 0.68
Number of walks per week >= 10 minutes	567	0.60	0.55, 0.65	314	0.55	0.48, 0.61
Minutes per walk	555	0.59	0.54, 0.65	307	0.59	0.52, 0.66
Usual speed of walk	556	0.60	0.54, 0.65	306	0.58	0.50, 0.66
Total exercise and recreational activity exposure	569	0.61	0.56, 0.66	314	0.51	0.42, 0.59
Form 42: Household and yard physical activity
Heavy indoor chores hours per week	517	0.52	0.45, 0.58	N/A*
Yard work, months per year	511	0.67	0.62, 0.71
Yard work, hours per week	509	0.64	0.59, 0.70
Historical strenuous physical activity
Strenuous physical activity at age 18 years	527	0.55**	0.48, 0.63	288	0.57**	0.47, 0.66
Strenuous physical activity at age 35 years	526	0.55**	0.48, 0.63	294	0.55**	0.45, 0.65
Strenuous physical activity at age 50 years	535	0.53**	0.46, 0.60	301	0.53**	0.44, 0.63

^*Only applicable for women who completed the recreational physical activity form

^#One episode of any recreational physical activity, regardless of intensity or duration

^**Simple kappa statistic