Table 2.
Questionnaire response rate within treatment groups by questionnaire time point
| Questionnaire time point | SMS text pre-notification n = 212 | No pre-notification n = 206 | E-mail reminder n = 60 | Postal reminder n = 59 |
|---|---|---|---|---|
| Four weeks: n/N | 121/212 | 106/206 | 41/60 | 39/59 |
| % | 57 % | 52 % | 68 % | 66 % |
| Adjusted odds ratio (95 % CI) | 1.24 (0.84–1.82)a; P = 0.290 | 1.11 (0.51–2.40)b; P = 0.796 | ||
| Twelve weeks: n/N | 89/212 | 87/206 | 33/60 | 32/59 |
| % | 42 % | 42 % | 55 % | 54 % |
| Adjusted odds ratio (95 % CI) | 0.97 (0.66–1.44)a; P = 0.895 | 1.03 (0.49–2.15)b; P = 0.937 | ||
Data are presented as number and percentages within each subcategory
SMS short messenger service, CI confidence interval
aAdjusted for age, sex, and reminder allocation
bAdjusted for age, sex, and pre-notification allocation