Table 2.

Associations of mean physical activity level and variability in physical activity level with 6-month weight change (N=26,935).

Physical activity characteristics				Model 1a				Model 2b
				β (95% CI) in kg		P value		β (95% CI) in kg		P value
Mean physical activity levelc
	For 1000 steps/day increased			−0.13 (−0.15 to −0.11)		<.001		−0.11 (−0.14 to −0.09)		<.001
	4-category step-defined physical activitye
		Sedentary (<5000 steps/day)	Reference		N/Af		Reference		N/A
		Low active (5000-7499 steps/day)	−0.25 (−0.41 to −0.10)		.001		−0.21 (−0.36 to −0.06)		.01
		Somewhat active (7500-9999 steps/day)	−0.60 (−0.78 to −0.42)		<.001		−0.52 (−0.70 to −0.33)		<.001
		Active (≥10,000 steps/day)	−1.23 (−1.46 to −1.00)		<.001		−1.17 (−1.42 to −0.93)		<.001
		P trend	N/A		<.001		N/A		<.001
Variability in physical activity level (physical activity level coefficient of variation)c
	For 10% increased			0.16 (0.12 to 0.19)		<.001		0.07 (0.04 to 0.11)		<.001
	Quartile groupse
		Q1 (≤ 40%, most regular)	−0.77 (−0.95 to −0.59)		<.001		−0.33 (−0.53 to −0.13)		.001
		Q2 (40%-51%)	−0.50 (−0.68 to −0.32)		<.001		−0.23 (−0.41 to −0.04)		.02
		Q3 (51%-63%)	−0.35 (−0.53 to −0.17)		<.001		−0.19 (−0.38 to −0.01)		.04
		Q4 (>63%, less regular)	Reference		N/A		Reference		N/A
		P trend	N/A		<.001		N/A		<.001

^aModel 1: univariable.

^bModel 2: adjusted for age, sex, systolic blood pressure, diastolic blood pressure, heart rate, and for the predominant season during the follow-up.

^cEvaluated during the first 30-day period of activity tracker use.

^dContinuous variables of mean physical activity level and physical activity level coefficient of variation were simultaneously included in the multivariable models.

^eCategorical variables of mean physical activity level and physical activity level coefficient of variation were simultaneously included in the multivariable models.

^fN/A: not applicable.