|  | Uni-variable | Multi-variable | ||||
---|---|---|---|---|---|---|---|
Trial and participant characteristics: | Study n | Weight change coefficient (95%CI) | p-value | Weight change coefficient (95%CI) | p-value | ||
Method of ascertaining SE of weight change | Â | Â | Â | Â | Â | Â | Â |
  Reported (ref = 0) | 23 |  |  |  |  |  |  |
  From SE/SD/exact p | 49 | −1.02 | (−2.00, -0.03) | 0.043 | −0.82 | (−1.85, 0.21) | 0.119 |
Sample size | Â | Â | Â | Â | Â | Â | Â |
  <100 (ref = 0) | 61 |  |  |  |  |  |  |
  ≥100 | 11 | −0.01 | (−0.85, 0.83) | 0.976 | 0.68 | (−0.32, 1.68) | 0.181 |
Trial design | Â | Â | Â | Â | Â | Â | Â |
  Quasi-experimental (ref = 0) | 6 |  |  |  |  |  |  |
  RCT | 66 | −1.11 | (−2.17, -0.06) | 0.038 | −0.37 | (−1.56, 0.81) | 0.538 |
Recruitment strategy | Â | Â | Â | Â | Â | Â | Â |
  Media appeal for volunteers (ref = 0) | 43 |  |  |  |  |  |  |
  Searches of existing registers | 29 | −0.03 | (−0.71, 0.66) | 0.937 | −0.13 | (−0.62, 0.88) | 0.732 |
Intervention duration | Â | Â | Â | Â | Â | Â | Â |
  ≤6 months (ref = 0) | 47 |  |  |  |  |  |  |
  >6 months | 25 | 0.29 | (−0.41, 1.00) | 0.412 | 0.72 | (−0.17, 1.61) | 0.113 |
Total number of assessments | Â | Â | Â | Â | Â | Â | Â |
  2 | 52 |  |  |  |  |  |  |
  >2 (ref = 0) | 20 | −0.47 | (−1.24, 0.30) | 0.234 | −0.27 | (−1.06, 0.51) | 0.492 |
Control group treatment | Â | Â | Â | Â | Â | Â | Â |
  No intervention control group (ref = 0) | 26 |  |  |  |  |  |  |
  Wait list control group | 13 | 0.26 | (−0.65, 1.16) | 0.579 | 0.85 | (−0.10, 1.80) | 0.079 |
  Usual care group | 33 | −0.84 | (−1.55, -0.13) | 0.021 | −1.23 | (−2.22, -0.23) | 0.016 |
Age | Â | Â | Â | Â | Â | Â | Â |
  ≤50 years (ref = 0) | 34 |  |  |  |  |  |  |
  >50 years | 35 | −0.01 | (−0.71, 0.69) | 0.971 | −0.32 | (−1.07, 0.43) | 0.406 |
Gender | Â | Â | Â | Â | Â | Â | Â |
  Mixed gender or mostly male (ref = 0) | 33 |  |  |  |  |  |  |
  Mostly female (>60 % female) | 39 | −0.22 | (−0.90, 0.45) | 0.517 | 0.14 | (−0.56, 0.84) | 0.695 |
Target population | Â | Â | Â | Â | Â | Â | Â |
  Chronic disease (ref = 0) | 23 |  |  |  |  |  |  |
  Healthy or at risk of chronic disease | 49 | −0.38 | (−1.09, 0.32) | 0.286 | −0.49 | (−1.26, 0.29) | 0.216 |
Baseline BMI category | Â | Â | Â | Â | Â | Â | Â |
  Healthy or overweight (≤ 30 kg/m2) (ref = 0) | 26 |  |  |  |  |  |  |
  Obese (> 30 kg/m2) | 43 | −0.24 | (−0.96, 0.48) | 0.513 | −0.24 | (−0.95, 0.47) | 0.501 |