Table 3. Primary outcome results.
| Primary
outcome |
Group | Hazard ratio (HR)/
Odds ratio (OR)/Mean difference (MD) |
95%
Confidence Interval |
p-value | Other |
|---|---|---|---|---|---|
|
Response
rate |
Pen received vs. not received | OR = 0.90 | 0.45, 1.80 | 0.77 | Total of 721/755 (95.5%)
returned tde 12-month questionnaire |
| Social incentive cover letter
received vs. not received |
OR = 0.84 | 0.42, 1.69 | 0.29 | ||
| Host trial allocation
(intervention vs. control) |
OR = 1.40 | 0.64, 3.23 | 0.38 | ||
| Age (per year) | OR = 0.96 | 0.91, 1.01 | 0.11 | ||
| Gender (male vs. female) | OR = 0.71 | 0.35, 1.44 | 0.35 |