Table 3.

Association between individual weather conditions and physical activity measures, unadjusted models^*

	Total Physical Activity†, counts			MVPA†, minutes			Inactivity†, minutes
	Estimate	SE	P	Estimate	SE	P	Estimate	SE	P
Intercept	301,383	12,844	< 0.0001	37	3.7	< 0.0001	300	5.8	< 0.0001
Day length, hours	12,167	989	< 0.0001	4	0.28	< 0.0001	−1.5	0.44	0.0007
Intercept	504,936	6,129	< 0.0001	103	1.9	< 0.0001	270	2.9	< 0.0001
Heating Degrees, °F	−2,844	195	< 0.0001	−0.9	0.055	< 0.0001	0.5	0.083	< 0.0001
Intercept	499,231	7412	< 0.0001	103	2.2	< 0.0001	266	3.8	< 0.0001
Cooling Degrees, °F	−5,325	626	< 0.0001	−1.6	0.18	< 0.0001	1.9	0.31	< 0.0001
Intercept	455,277	4391	< 0.0001	89	1.4	< 0.0001	281	2.3	< 0.0001
Precipitation, inches	−44,807	5935	< 0.0001	−14	1.7	< 0.0001	6	2.6	0.02
Intercept	470,445	5441	< 0.0001	94	1.7	< 0.0001	278	2.7	< 0.0001
Wind, miles per hour	−3,496	562	< 0.0001	−1.1	0.16	< 0.0001	0.7	0.25	0.007

^*Estimated using mixed effects regression models. Weather variables were modeled as fixed effects and subject and intercept were specified as random effects.

^†Physical activity measures represent daily values, recorded while accelerometer was worn, on valid days, i.e., days with ≥ 8 hours wear time.