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| Mean difference | 95% confidence interval | P-value | |
|---|---|---|---|
| Omitting Ipema (2012) | 218 | -56.5–492.6 | 0.120 |
| Omitting Pierratos (1997) | 173 | -6.6–351.8 | 0.059 |
| Omitting Sikkes (2009) | 179 | -11.3–368.3 | 0.065 |
| Pooled estimate | 183 | 16.8–349.7 | 0.031 |
