| Volume of first void (median and range) | |||
| Study | Midnight removal | Morning removal | Significance |
| Following gynaecological surgery | |||
| Ind 1993 | 275 ml (10 to 600 ml) 49 participants |
100 ml (5 to 450 ml) 46 participants |
P < 0.0001 (95% CI 124.9 to 225.5) |
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