Table 2.
Mean use of features, per lesson for the features SMS and video.
| Lesson No. | SMS featurea, n | SMS onb, n | SMS offb, n | SMS viewedc, mean (SD) | Unique SMS viewedd, mean (SD) | Video featurea, n | Videos viewed, mean (SD) | Unique videos viewed, mean (SD) |
| 1 | 105 | 13 | 3 | 1.44 (2.35) | 0.95 (1.27) | 116 | 0.59 (0.94) | 0.40 (0.49) |
| 2 | 98 | 2 | 0 | 1.32 (2.43) | 0.99 (1.62) | 109 | 0.44 (0.87) | 0.28 (0.45) |
| 3 | 85 | 0 | 0 | 1.09 (2.29) | 0.86 (1.68) | 96 | 0.61 (1.32) | 0.39 (0.49) |
| 4 | 79 | 0 | 0 | 1.54 (3.39) | 1.19 (2.39) | 91 | 0.74 (1.05) | 0.45 (0.50) |
| 5 | 74 | 0 | 0 | 0.96 (2.62) | 0.84 (2.19) | 90 | 0.66 (0.96) | 0.46 (0.54) |
| 6 | 73 | 1 | 0 | 1.21 (3.86) | 0.99 (2.55) | 87 | 0.49 (0.54) | 0.40 (0.56) |
| 7 | 71 | 1 | 0 | 0.86 (2.26) | 0.68 (1.80) | 79 | 0.66 (1.32) | 0.42 (0.52) |
| 8 | 66 | 0 | 0 | 2.44 (2.14) | 2.14 (5.95) | 71 | 0.66 (0.99) | 0.48 (0.61) |
| 9 | 63 | 0 | 2 | 1.92 (6.05) | 1.48 (4.56) | 64 | 0.05 (0.38) | 0.03 (0.25) |
aNumber of participants who received the intervention with the feature included.
bNumber of participants who turned the SMS coach on/off in a particular lesson.
cNumber of SMS messages viewed within the Web-based intervention.
dUnique per lesson, that is, the number of different messages that a participant used in a particular lesson.