Table 2.
Subgroup analyses of lifestyle intervention on body weight by TIDieR components.
| TIDieR Components | Studies a | Mean Difference, kg (95%CI) | I2 (%) | P for Subgroup Differences |
|---|---|---|---|---|
| Use of theory | 0.280 | |||
| Yes | 34 | −2.25 (−2.94, −1.55) | 88.5 | |
| No | 8 | −1.63 (−2.71, −0.55) | 60.1 | |
| Intervention provider | 0.395 | |||
| With health professional | 30 | −2.27 (−3.02, −1.51) | 89.5 | |
| Without health professional | 12 | −1.79 (−2.71, −0.87) | 64.3 | |
| Intervention duration | 0.404 | |||
| Short (<12 months) | 25 | −2.34 (−3.12, −1.55) | 80.4 | |
| Long (≥12 months) | 17 | −1.85 (−2.79, −0.90) | 90.3 | |
| Number of sessions | 0.015 | |||
| Low (≤15 sessions) | 23 | −1.48 (−2.29, −0.66) | 85.0 | |
| High (≥16 sessions) | 19 | −2.79 (−3.58, −2.01) | 82.6 | |
| Delivery format | 0.996 | |||
| Group | 12 | −2.15 (−3.55, −0.75) | 91.9 | |
| Individual | 9 | −2.09 (−3.19, −0.98) | 69.5 | |
| Combined | 21 | −2.13 (−3.01, −1.24) | 84.6 | |
| Technology (e.g., phone, website) | 0.590 | |||
| With technology | 26 | −2.25 (−2.98, −1.53) | 83.6 | |
| In-person only | 16 | −1.92 (−3.02, −0.81) | 89.1 | |
| Location of intervention | 0.096 | |||
| Researcher-based | 8 | −1.46 (−1.97, −0.94) | 16.0 | |
| Participant-based | 24 | −2.31 (−3.11, −1.51) | 88.1 | |
| Combined | 10 | −2.39 (−4.04, −0.74) | 90.9 | |
| Tailoring | 0.911 | |||
| Yes | 31 | −2.11 (−2.84, −1.38) | 87.4 | |
| No | 11 | −2.18 (−3.26, −1.09) | 83.6 | |
| Fidelity | 0.271 | |||
| Low/medium | 16 | −1.76 (−2.58, −0.94) | 74.8 | |
| High | 26 | −2.37 (−3.20, −1.54) | 89.6 |
a Number of studies by ethnic groups.