From: Changes in physical activity after joining a bikeshare program: a cohort of new bikeshare users
Negative binomial regression. Continuous outcome | Multinomial logistic regression. 3-category outcome (stayed the same 73.3%, became more active 15.2%, became inactive 11.5%) | |||||||||||
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Outcome 1. MVPA minutes at follow-up, controlling for baseline MVPA | Outcome 2A. Became more active vs. stayed the sameb | Outcome 2B. Became inactive vs. stayed the sameb | ||||||||||
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 | ||||||||||||
1.29 | 1.26 | 1.31 | 0.014 | 1.02 | 0.99 | 1.04 | 0.198 | 0.94 | 0.89 | 0.99 | 0.029 | |
ii. Categorical exposure, past year change days used the program d | ||||||||||||
No use, zero days | Referent | Referent | Referent | |||||||||
Low use, 1—< 15 days | 0.68 | 0.50 | 0.92 | 0.014 | 1.45 | 0.83 | 2.52 | 0.189 | 1.54 | 0.88 | 2.71 | 0.133 |
Higher use, 15 + days | 1.03 | 0.76 | 1.40 | 0.835 | 1.80 | 1.05 | 3.09 | 0.033 | 0.64 | 0.35 | 1.18 | 0.154 |
B. Exposure to bikeshare or personal bike | ||||||||||||
i. Categorical exposure, change in recent bike use (past 30 day personal or bikeshare use) e | ||||||||||||
No bike use at follow-up | Referent | Referent | Referent | |||||||||
Bike use at baseline + follow-up | 1.52 | 1.10 | 2.11 | 0.012 | 0.93 | 0.51 | 1.69 | 0.819 | 0.33 | 0.16 | 0.71 | 0.004 |
New bike use at follow-up (not baseline) | 1.50 | 1.15 | 1.96 | 0.003 | 1.04 | 0.67 | 1.61 | 0.848 | 0.55 | 0.32 | 0.97 | 0.039 |