Changes in physical activity after joining a bikeshare program: a cohort of new bikeshare users

Table 4 Regression results with walking included in MVPA. Adjusted^a within-person differences in moderate or vigorous physical activity (MVPA, with walking) minutes and change in activity status (became active, became inactive), according to number of days used the program and used any type of bike. N = 1031

	Negative binomial regression. Continuous outcome				Multinomial logistic regression. 3-category outcome (stayed the same 79.0%, became active 9.9%, became inactive 11.2%)
	Outcome 1. MVPA minutes at follow-up, controlling for baseline MVPA				Outcome 2A. Became active vs. stayed the same^b				Outcome 2B. Became inactive vs. stayed the same^b
		95% Confidence Interval				95% Confidence Interval				95% Confidence Interval
	Exp(β)	Low	High	P-value	Exp(β)	Low	High	P-value	Exp(β)	Low	High	P-value
A. Exposure to bikeshare
i. Exposure is continuous change in 10 days of program use ^c
Continuous, per 10 days used program	1.01	1.00	1.02	0.116	0.95	0.90	0.96	0.064	1.00	0.96	1.05	0.858
ii. Categorical exposure, past year change days used the program ‡
No use, zero days	Referent				Referent				Referent
Low use, 1—< 15 days	0.78	0.65	0.95	0.013	1.16	0.64	2.13	0.621	1.18	0.65	2.14	0.587
Higher use, 15 + days	0.96	0.79	1.15	0.647	0.83	0.44	1.55	0.556	1.21	0.67	2.18	0.537
B. Exposure to bikeshare or personal bike
i. Categorical exposure, change in recent bike use (past 30 day personal or bikeshare use)
No bike use at follow-up	Referent				Referent				Referent
Bike use at baseline + follow-up	1.20	0.98	1.48	0.073	0.56	0.27	1.19	0.134	0.79	0.38	1.63	0.515
New bike use at follow-up (not baseline)	1.23	1.05	1.45	0.011	0.63	0.36	1.12	0.113	1.11	0.67	1.84	0.688

^a Results adjusted for socio-demographics (age, sex, race/ethnicity, disadvantage, per capita income, household composition), number of cars, health status (presence of chronic illness, health status in past month), stayed at same residence, survey season, past 7 days weather, neighborhood biking infrastructure (stations, bikeability, distance to city hall), baseline bike use (personal or bikeshare)
^b “Inactive” in this table is defined as less than 150 min per week of MVPA including walking. "More active" refers to not inactive
^c Past year program use at follow-up minus baseline. The model adjusted for all covariates listed above except for baseline program use; this aimed to improve interpretation, even though inference was unchanged

ISSN: 1479-5868