Table 2.
Physical Activity Outcomes
| Baseline | Ramp‐up (Weeks 1–8) | Maintenance (Weeks 9–16) | Follow‐up (Weeks 17–24) | |
|---|---|---|---|---|
| Steps per day, Mean (SD) | ||||
| Control arm | 6577 (3084) | 6962 (3364) | 6841 (3254) | 6669 (3091) |
| Incentive arm | 7205 (3246) | 8593 (3204) | 8705 (3107) | 8271 (3003) |
| Main model | ||||
| Difference adjusted for baseline (95% CI) | ··· | 1061 (386, 1736) | 1368 (571, 2164) | 1154 (282, 2027) |
| P value | ··· | <0.01 | <0.001 | <0.01 |
| Fully adjusted model | ||||
| Difference adjusted for baseline (95% CI) | ··· | 742 (−27, 1510) | 1216 (350, 2082) | 1063 (128, 1997) |
| P value | ··· | 0.06 | <0.01 | 0.03 |
Models compare the incentive arm with the control arm using imputed data and the least squares means command. Main model adjusts for baseline step count and fixed effects for calendar month and study arm. Fully adjusted model also added the following covariates: age, sex, race/ethnicity, education, marital status, household income, body mass index, days since last cardiac catheterization, most recent ejection fraction, and history of diabetes mellitus, hypertension, hyperlipidemia, smoking, and valvular heart disease. CI indicates confidence interval.