Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Meta-Analysis Results
| Year | Effect size (95% CI) | Heterogeneity (Q) | Percent control (95% CI) |
|---|---|---|---|
| 1 | −0.23 (−0.38, −0.07) | 43* | 22 (7, 37) |
| 2 | −0.43 (−0.59, −0.28) | 66* | 39 (26, 52) |
| 3 | −0.67 (−0.83, −0.51) | 30 | 48 (37, 59) |
| 4 | −0.87 (−1.01, −0.74) | 12 | 62 (53, 71) |
| 5 | −0.79 (−0.96, −0.63) | 11 | 61 (49, 73) |
| 6 | −0.91 (−1.07, −0.74) | 13 | 71 (59, 83) |
| 7 | −0.16 (−0.33, −0.002) | 36* | 18 (0, 36) |
CI, confidence interval.
Significant between-comparison heterogeneity.
