Table 4.
Outcome retention rates at 3-, 6-, and 12-month follow-ups by survey modality.
| Parameter | Follow-up assessmenta | |||
|
|
|
3-month, n (%) | 6-month, n (%) | 12-month, n (%) |
| Online | ||||
|
|
≤24 hours of an email | 1290 (49.09) | 1460 (55.56) | 1511 (57.50) |
|
|
Before any calls | 290 (11.0) | 308 (11.72) | 296 (11.26) |
|
|
After 1-2 calls | 292 (11.04) | 243 (9.25) | 176 (6.70) |
|
|
After ≥3 calls | 237 (9.02) | 142 (5.40) | 141 (5.37) |
|
|
Online total | 2109 (80.25) | 2153 (81.93) | 2124 (80.82) |
| Phone | ||||
|
|
Within 1-2 calls | 34 (1.29) | 25 (0.95) | 36 (1.37) |
|
|
After ≥3 calls | 28 (1.07) | 14 (0.53) | 23 (0.88) |
|
|
Phone total | 62 (2.36) | 39 (1.48) | 59 (2.25) |
| Paper | 111 (4.22) | 95 (3.61) | 83 (3.16) | |
| Postcard | 53 (2.02) | 56 (2.13) | 51 (1.94) | |
| Total number of surveys completed | 2335 (88.85) | 2343 (89.16) | 2317 (88.17) | |
aData include all randomized participants except for nine that we were unable to classify into one of the five recruitment strategies.