Table 2 Estimation of the standardized difference means of related indictors with CI 95% between the intervention and placebo groups
Variables | Number of study | Standardized mean difference | CI 95% | Heterogeneity | |||
|---|---|---|---|---|---|---|---|
I-squared (%) | Q | P-value | |||||
Triglycerides | Intervention group (after vs. before) | 12 | − 1.84 | − 2.62, − 1.06 | 95.6 | 248.31 | < 0.001 |
Placebo group (after vs. before) | 12 | − 0.17 | − 0.39, 0.05 | 53.9 | 23.84 | 0.01 | |
Intervention group vs. placebo group | 12 | − 1.24 | − 1.84, − 0.64 | 93.2 | 161.55 | < 0.001 | |
Total cholesterol | Intervention group (after vs. before) | 11 | − 1.40 | − 2.11, − 0.69 | 94.7 | 189.67 | < 0.001 |
Placebo group (after vs. before) | 11 | 0.22 | −0.17, 0.61 | 84.7 | 65.30 | < 0.001 | |
Intervention group vs. placebo group | 11 | −1.19 | − 1.83, −0.55 | 93.6 | 156.53 | < 0.001 | |
LDL-cholesterol | Intervention group (after vs. before) | 5 | −1.28 | −2.37, −0.18 | 94.4 | 71.88 | < 0.001 |
Placebo group (after vs. before) | 5 | 0.23 | 0.02, 0.44 | 0.00 | 3.13 | 0.53 | |
Intervention group vs. placebo group | 5 | −1.31 | −2.23, −0.39 | 92.2 | 51.00 | < 0.001 | |
HDL-cholesterol | Intervention group (after vs. before) | 10 | 0.37 | −0.13, 0.87 | 90.7 | 96.93 | < 0.001 |
Placebo group (after vs. before) | 10 | −0.02 | − 0.20, 0.15 | 27.2 | 12.37 | 0.19 | |
Intervention group vs. placebo group | 10 | 0.20 | −0.27, 0.67 | 89.4 | 84.52 | < 0.001 | |