Table 3.
Adjusted least square means for between-group comparisons: weight and BMI changes
| Within-group change (intervention) | Within-group change (control) | Between-group difference (intervention - control) | ||
|---|---|---|---|---|
| Mean Change (95% CI) | Mean Change (95% CI) | Mean Change (95% CI) | p-value | |
| Among all social network members | ||||
| Weight (kg) | ||||
| Very close relationship (intervention n=102; control n=60) | −1.52 (−2.61, −0.44) | +0.15 (−1.17, +1.48) | −1.68 (−3.10, −0.25) | 0.021 |
| Somewhat or not very close relationship (intervention n=68; control n=55) | +0.27 (−1.09, +1.62) | −0.14 (−1.61, +1.32) | +0.41 (−1.26, +2.08) | 0.630 |
| Spatially close (intervention n=94, control n=77) | −0.70 (−1.86, +0.46) | −0.38 (−1.64, +0.89) | −0.32 (−1.74, +1.10) | 0.658 |
| Not spatially close (intervention n=76, control n=38) | −1.39 (−2.63, −0.14) | +0.48 (−1.09, +2.06) | −1.87 (−3.59, −0.14) | 0.034 |
| BMI | ||||
| Very close relationship (intervention n=94; control n=49) | −0.47 (−0.87, −0.06) | +0.14 (−0.37, +0.64) | −0.60 (−1.16, −0.04) | 0.034 |
| Somewhat or not very close relationship (intervention n=63; control n=47) | +0.14 (−0.38, +0.65) | −0.004 (−0.56, +0.55) | +0.14 (−0.50, +0.78) | 0.670 |
| Spatially close (intervention n=90, control n=67) | −0.18 (−0.64, +0.27) | −0.02 (−0.53, +0.49) | −0.17 (−0.76, +0.42) | 0.579 |
| Not spatially close (intervention n=67, control n=29) | −0.50 (−1.00, −0.01) | +0.20 (−0.46, +0.85) | −0.70 (−1.44, +0.04) | 0.063 |
| Among social network members who had a very close relationship with trial participants | ||||
| Weight (kg) | ||||
| Spatially close (intervention n=56, control n=37) | −1.43 (−2.96, +0.11) | −0.91 (−2.71, +0.90) | −0.52 (−2.57, +1.52) | 0.617 |
| Not spatially close (intervention n=46, control n=23) | −2.07 (−3.69, −0.45) | +1.21 (−0.94, +3.35) | −3.28 (−5.57, −0.99) | 0.005 |
| BMI | ||||
| Spatially close (intervention n=52, control n=32) | −0.33 (−0.91, +0.24) | −0.11 (−0.80, +0.59) | −0.23 (−1.03, +0.57) | 0.574 |
| Not spatially close (intervention n=42, control n=17) | −0.66 (−1.27, −0.04) | +0.52 (−0.35, +1.40) | −1.18 (−2.12, −0.24) | 0.014 |
| Social network members who were spatially close to trial participants | ||||
| Weight (kg) | ||||
| Very close relationship (intervention n=53, control n=37) | −0.89 (−2.09, +0.31) | −0.50 (−1.90, +0.89) | −0.39 (−1.93, +1.15) | 0.619 |
| Somewhat or not very close relationship (intervention n=40, control n=42) | +0.37 (−1.13, +1.87) | −0.02 (−1.50, +1.47) | +0.39 (−1.21, +1.99) | 0.631 |
| BMI | ||||
| Very close relationship (intervention n=49, control n=32) | −0.21 (−0.64, +0.21) | −0.07 (−0.59, +0.44) | −0.14 (−0.71, +0.44) | 0.635 |
| Somewhat or not very close relationship (intervention n=38, control n=36) | +0.21 (−0.33, +0.75) | −0.08 (−0.63, +0.46) | +0.30 (−0.29, +0.88) | 0.321 |
Significant p-values are indicated in bold. All models controlled for social network members’ age, sex, education, relationship status, employment status, self-rated health, trial participants’ program attendance, and baseline value of outcome of interest as fixed effects. Trial program sites and trial participants’ identification number were treated as random effects in all models.