Table 5.

Generalized estimating equation results for the average number of steps taken per day or number of floors (10 ft) climbed per day across each week during the 6-week intervention.

Physical activity			Intervention effect (with respect to the control group)
			Percentage changea		95% CI		P valueb
Stepping activity (weekly average number of steps taken per day)
	Weekly challenge
		Common effect across all weeks		9.0		−7.3 to 28.1		.30
Stair climbing activity (weekly average number of floors climbed per day)
	Weekly challenge
		Week 1 (steps)		−6.3		−35.5 to 36.2		.73
		Week 2 (stairs)		18.2		−15.1 to 64.5		.32
		Week 3 (steps+stairs)		24.9		−20.4 to 95.8		.33
		Week 4 (step)		15.1		−23.5 to 73.2		.50
		Week 5 (stairs)		78.5		20.8 to 163.8		.004
		Week 6 (steps+stairs)		25.3		−8.3 to 71.1		.16

^aGeneralized estimating equation: (family: Gaussian; link: identity) analyses adjusted for its baseline physical activity, age, and gender.

^bThe interaction term (Group x week) has a P value of 0.12 and <.001 for stepping and stair climbing activities, respectively