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| Study | Immediate, n/N (%) | Delayed, n/N (%) | OR | 95% CI | P-value |
|---|---|---|---|---|---|
| Nordic | 51/93 (55) | 34/90 (38) | 2.04 | 1.13–3.7 | 0.03 |
| Australasian | 31/50 (62) | 24/51 (47) | 1.84 | 0.83–4.1 | 0.13 |
| Canadian | 17/34 (50) | 15/33 (45) | 1.20 | 0.46–3.1 | 0.7 |
| All studiesa | 1.63 | 0.71–3.7 | 0.25 | ||
| Australia and Canadab | 1.40 | 0.47–4.1 | 0.5 |
OR=odds ratio; CI=confidence interval.
Tests for heterogeneity at P=0.8.
Tests for heterogeneity at P=0.7.
