Table 2. Mean (s.d.) weight (kg) showing weight change according to intervention type and baseline BMI (HW and) using ITT analysis.
| Data collection point | Group | MI | SDI | Unadjusted difference P-value (95% CI) | Difference at 12 months (adjusted) P-value (95% CI) |
|---|---|---|---|---|---|
| Baseline group | 68.7 (7.9) | 68.7 (8.9) | 68.6 (6.7) | 0.982 (−4.30; 4.39) | __ |
| HW only | 62.9 (5.3) | 62.0 (6.4) | 63.9 (3.7) | 0.373 (−6.01; 2.36) | __ |
| OW only | 74.4 (5.5) | 75.3 (5.4) | 73.4 (5.6) | 0.365 (−2.41; 6.32) | __ |
| 3 Months group | 67.5 (8.0) | 67.3 (8.9) | 67.7 (7.1) | 0.863 (−4.80; 4.03) | __ |
| HW only | 61.5 (5.1) | 60.6 (5.9) | 62.5 (4.0) | 0.356 (−5.86; 2.19) | __ |
| OW only | 73.4 (5.6) | 73.9 (5.9) | 72.9 (5.5) | 0.629 (−3.44; 5.58) | __ |
| 12 Months group | 66.5 (7.7) | 65.6 (8.5) | 67.4 (6.7) | 0.402 (−5.99; 2.44) | 0.034 (−3.490; −0.145) |
| HW only | 61.6 (5.3) | 59.5 (5.4) | 63.8 (4.4) | 0.032 (−8.23; −0.40) | 0.002 (−4.383; −1.085) |
| OW only | 71.5 (6.4) | 71.8 (6.3) | 71.1 (6.8) | 0.764 (−4.42; 5.95) | 0.467 (−4.258; 2.011) |
Abbreviations: BMI, body mass index; CI, confidence interval; HW, healthy weight; OW, overweight; MI, motivational interviewing; s.d., standard deviation; SDI, self-directed intervention; ITT, intention to treat.
Baseline: group—N=54, MI=28, SDI=26; HW—N=27, MI=14, SDI=13; OW—N=27, MI=14, SDI=13.
3 Months: group—N=49, MI=26, SDI=23; HW—N=25, MI=14 SDI=11; OW—N=22, MI=12, SDI=10.
12 Months: group—N=40, MI=22, SDI=18; HW—N=24, MI=14, SDI=10; OW—N=16, MI=8, SDI=8.