Effect of opt-in and opt-out on proportion of participants recruited by age, sex and socioeconomic status
| Opt-in (n = 92) | Opt-out (n = 60) | p Value | |
|---|---|---|---|
| SES, socioeconomic status. | |||
| Values in parentheses are percentages. | |||
| Each value is the number participating as a proportion of the number eligible from the sample. | |||
| *Significant at p = 0.05. | |||
| Age in years (%) | |||
| 50–54 | 12/30 (40) | 10/20 (50) | 0.49 |
| 55–64 | 22/40 (55) | 21/26 (80.1) | 0.03* |
| 65–74 | 10/22 (45.6) | 9/14 (64.3) | 0.27 |
| Sex | |||
| Male | 13/29 (44.8) | 17/24 (70.1) | 0.06 |
| Female | 31/63 (49.2) | 23/36 (63.9) | 0.16 |
| SES | |||
| Low | 6/12 (50) | 4/8 (50) | 1.0 |
| High | 38/80 (47.5) | 36/52 (69.2) | 0.01* |