Table 4.
Intervention adherence by condition and cohort, mean (SD)
| Incentives for weight loss and self- monitoring | Incentives for self -monitoring only | Incentives for weight loss only | No incentives for weight loss or self- monitoring | Total | |
|---|---|---|---|---|---|
| Number of group sessions attended | |||||
| Cohort 1 (of 13) | 8.78 (2.22) | 9.25 (1.91) | 8.75 (2.66) | 6.25 (3.54) | 8.27 (2.78) |
| Cohort 2 (of 13) | 8.43 (2.76) | 7.00 (3.21) | 5.75 (2.49) | 7.50 (4.47) | 7.13 (3.31) |
| Cohort 3 (of 14) | 7.14 (4.22) | 9.60 (1.14) | 7.29 (3.15) | 6.75 (2.49) | 7.52 (3.06) |
| Number of calories tracked per weekday on days where some kcal were tracked | |||||
| Cohort 1 | 1,278.18 (150.26) | 1,354.14 (287.67) | 1,260.84 (231.58) | 1,016.29 (274.75) | 1,227.90 (261.89) |
| Cohort 2 | 1,386.10 (280.49) | 1,617.64 (595.82) | 1,223.29 (156.50) | 1,185.70 (367.10) | 1,365.92 (424.69) |
| Cohort 3 | 1,089.22 (141.13) | 1,345.52 (234.93) | 1,271.37 (491.94) | 1,004.47 (542.44) | 1,177.26 (366.69) |
| Number of calories tracked per weekend day on days where some kcal were tracked | |||||
| Cohort 1 | 1,290.45 (218.04) | 1,380.36 (213.88) | 1,270.01 (220.24) | 1,035.22 (267.99) | 1,244.65 (255.01) |
| Cohort 2 | 1,466.82 (282.69) | 1,617.98 (678.04) | 1,110.21 (474.93) | 1,188.62 (380.63) | 1,376.35 (499.16) |
| Cohort 3 | 1,145.85 (257.90) | 1,379.86 (226.16) | 1,070.13 (701.31) | 966.34 (651.57) | 1,148.02 (481.67) |
| Number of weekdays (of 5) tracked per week | |||||
| Cohort 1 | 3.41 (1.75) | 4.19 (1.65) | 2.69 (2.11) | 2.41 (1.50) | 3.17 (1.83) |
| Cohort 2 | 3.84 (1.54) | 3.82 (1.33) | 0.90 (0.86) | 2.42 (1.41) | 2.77 (1.73) |
| Cohort 3 | 2.86 (1.82) | 3.25 (1.64) | 2.12 (1.76) | 1.89 (1.99) | 2.57 (1.77) |
| Number of weekend days (of 2) tracked per week | |||||
| Cohort 1 | 1.35 (0.72) | 1.65 (0.68) | 1.06 (0.84) | 0.92 (0.56) | 1.24 (0.73) |
| Cohort 2 | 1.55 (0.66) | 1.50 (0.54) | 0.19 (0.23) | 0.90 (0.60) | 1.04 (0.75) |
| Cohort 3 | 1.08 (0.80) | 1.38 (0.70) | 0.85 (0.69) | 0.67 (0.73) | 1.01 (0.73) |
| Number of study days (of 168) participants tracked the minimum number of calories | |||||
| Cohort 1 | 108.30 (57.91) | 121.10 (52.65) | 85.14 (55.26) | 42.13 (35.23) | 89.91 (57.51) |
| Cohort 2 | 113.1 (51.47) | 121.4 (43.92) | 23.80 (17.25) | 64.75 (47.34) | 85.71 (55.91) |
| Cohort 3 | 75.86 (62.25) | 105.0 (54.4) | 44.50 (60.04) | 48.20 (67.83) | 69.54 (61.92) |
| Number of times self-weighed per week | |||||
| Cohort 1 | 4.93 (1.44) | 5.91 (0.99) | 4.32 (2.22) | 4.03 (1.95) | 4.79 (1.80) |
| Cohort 2 | 4.96 (1.96) | 4.89 (1.70) | 3.09 (1.00) | 4.16 (2.63) | 4.21 (1.98) |
| Cohort 3 | 4.48 (1.97) | 5.78 (0.42) | 4.13 (1.92) | 2.25 (2.17) | 4.03 (2.13) |
| Number of weeks (of 24) self-weighed at least twice | |||||
| Cohort 1 | 21.22 (5.14) | 23.50 (1.07) | 18.11 (7.93) | 18.88 (6.58) | 20.38 (5.96) |
| Cohort 2 | 20.43 (5.77) | 15.75 (10.29) | 17.63 (5.66) | 17.00 (9.24) | 17.61 (7.85) |
| Cohort 3 | 19.43 (6.08) | 18.00 (8.83) | 17.00 (6.73) | 9.86 (8.53) | 16.00 (8.08) |
| Number of weeks (of 24) incentives earned for dietary tracking | |||||
| Cohort 1 | 9.78 (3.11) | 10.13 (3.60) | NA | NA | 9.94 (3.25) |
| Cohort 2 | 9.57 (3.95) | 10.13 (3.18) | NA | NA | 9.87 (3.44) |
| Cohort 3 | 11.50 (9.59) | 16.17 (9.09) | NA | NA | 13.83 (9.23) |
| Number of weeks (of 24) incentives earned for interim weight loss | |||||
| Cohort 1 | 8.97 (2.29) | NA | 8.38 (3.07) | NA | 8.53 (2.60) |
| Cohort 2 | 7.71 (2.98) | NA | 6.50 (2.45) | NA | 7.07 (2.69) |
| Cohort 3 | 12.00 (5.74) | NA | 11.57 (4.69) | NA | 11.79 (5.04) |
| Incentives earned (of $300) | |||||
| Cohort 1 | $214.11 (61.05) | $234.50 (80.55) | $189.25 (70.89) | NA | $212.68 (70.31) |
| Cohort 2 | $203.14 (78.82) | $231.25 (78.09) | $151.00 (54.44) | NA | $194.78 (76.03) |
| Cohort 3 | $162.14 (100.32) | $236.67 (115.62) | $160.86 (57.74) | NA | $184.05 (94.86) |