TABLE 2.
Average number of days per month of dietary self-monitoring, daily self-monitoring minutes, and daily log-ins to self-monitoring Web page for total sample and among those who lost ≥ 5% and ≥ 10% of baseline weight (using imputed weight) at 6 months
| All | < 5% WL | ≥ 5% WL | P value | < 10% WL | ≥ 10% WL | P value | |
|---|---|---|---|---|---|---|---|
| Month 1 | |||||||
| n | 142 | 71 | 71 | 108 | 34 | ||
| Minutes/day | 23.2 ± 10.1 | 22.0 ± 8.1 | 24.5 ± 11.7 | 0.279 | 23.2 ± 10.6 | 23.3 ± 8.4 | 0.466 |
| Sessions/day | 2.5 ± 1.2 | 2.3 ± 1.0 | 2.8 ± 1.3 | < 0.001 | 2.3 ± 0.9 | 3.2 ± 1.7 | < 0.001 |
| Days/month | 19.4 ± 7.5 | 17.4 ± 7.1 | 21.3 ± 7.4 | 0.001 | 18.0 ± 7.5 | 23.7 ± 5.7 | < 0.001 |
| Number with no log-ins | 0 | 0 | 0 | 0 | 0 | ||
| Month 2 | |||||||
| n | 134 | 66 | 68 | 100 | 34 | ||
| Minutes/day | 19.3 ± 9.1 | 19.0 ± 9.2 | 19.5 ± 9.0 | 0.566 | 19.0 ± 9.1 | 20.0 ± 9.1 | 0.468 |
| Sessions/day | 2.3 ± 1.2 | 2.0 ± 0.8 | 2.7 ± 1.5 | 0.001 | 2.1 ± 0.8 | 3.2 ± 1.8 | < 0.001 |
| Days/month | 17.9 ± 9.0 | 14.3 ± 9.0 | 21.3 ± 7.7 | < 0.001 | 15.8 ± 8.7 | 23.8 ± 7.4 | < 0.001 |
| Number with no log-ins | 8 (6%) | 5 (7%) | 3 (4%) | 0.719 | 8 (7%) | 0 | 0.199 |
| Month 3 | |||||||
| n | 124 | 58 | 66 | 91 | 33 | ||
| Minutes/day | 18.1 ± 10.7 | 18.0 ± 11.2 | 18.2 ± 10.3 | 0.859 | 18.3 ± 11.3 | 17.7 ± 9.0 | 0.897 |
| Sessions/day | 2.2 ± 1.2 | 1.8 ± 0.7 | 2.5 ± 1.5 | < 0.001 | 1.8 ± 0.6 | 3.2 ± 1.9 | < 0.001 |
| Days/month | 16.0 ± 9.9 | 10.9 ± 8.8 | 20.4 ± 8.7 | < 0.001 | 12.9 ± 8.8 | 24.5 ± 7.6 | < 0.001 |
| Number with no log-ins | 18 (13%) | 13 (18%) | 5 (7%) | 0.075 | 17 (16%) | 1 (3%) | 0.073 |
| Month 4 | |||||||
| n | 111 | 47 | 64 | 79 | 32 | ||
| Minutes/day | 15.6 ± 8.6 | 14.9 ± 9.4 | 16.1 ± 7.9 | 0.422 | 15.3 ± 8.8 | 16.2 ± 8.0 | 0.534 |
| Sessions/day | 2.1 ± 1.2 | 1.7 ± 0.5 | 2.5 ± 1.4 | < 0.001 | 1.8 ± 0.6 | 2.9 ± 1.9 | 0.001 |
| Days/month | 15.9 ± 9.4 | 11.5 ± 8.1 | 19.1 ± 9.0 | < 0.001 | 12.7 ± 8.1 | 23.9 ± 7.5 | < 0.001 |
| Number with no log-ins | 31 (22%) | 24 (34%) | 7 (10%) | 0.001 | 29 (27%) | 2 (6%) | 0.009 |
| Month 5 | |||||||
| n | 98 | 37 | 61 | 65 | 33 | ||
| Minutes/day | 16.1 ± 9.0 | 15.4 ± 9.3 | 16.5 ± 8.9 | 0.420 | 16.1 ± 9.2 | 15.9 ± 8.7 | 0.907 |
| Sessions/day | 2.1 ± 1.1 | 1.7 ± 0.6 | 2.3 ± 1.3 | 0.004 | 1.8 ± 0.6 | 2.7 ± 1.6 | 0.001 |
| Days/month | 14.2 ± 10.1 | 9.4 ± 8.1 | 17.1 ± 10.1 | < 0.001 | 10.9 ± 9.0 | 20.8 ± 8.9 | < 0.001 |
| Number with no log-ins | 44 (31%) | 34 (48%) | 10 (14%) | < 0.001 | 43 (40%) | 1 (3%) | < 0.001 |
| Month 6 | |||||||
| n | 93 | 34 | 59 | 61 | 32 | ||
| Minutes/day | 14.6 ± 9.6 | 13.7 ± 8.6 | 15.1 ± 10.1 | 0.786 | 13.9 ± 9.9 | 16.0 ± 8.8 | 0.141 |
| Sessions/day | 2.1 ± 1.1 | 1.6 ± 0.5 | 2.4 ± 1.2 | 0.001 | 1.7 ± 0.5 | 2.7 ± 1.4 | < 0.001 |
| Days/month | 14.5 ± 10.1 | 9.0 ± 8.2 | 17.6 ± 9.8 | < 0.001 | 11.2 ± 8.9 | 20.8 ± 9.2 | < 0.001 |
| Number with no log-ins | 49 (34%) | 37 (52%) | 12 (17%) | < 0.001 | 47 (43%) | 2 (6%) | < 0.001 |
Results for minutes/day, sessions/day, and days/month include only participants with at least 1 minute of self-reported monitoring within the month. Comparisons for minutes/day, sessions/day, and days/month were conducted using the Wilcoxon rank sum. Comparisons for number with no log-ins was conducted using Fisher exact test. WL, weight loss.