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The Unmatched Factors between the Male and the Female Co-twins in Mixed Gender Twins.
| The male twins | The female co-twins | P | |
|---|---|---|---|
| Birth weight (g, Mean, SD) | 2200 (796) | 2094 (778) | <0.001 |
| Birth order | 0.02 | ||
| First | 48,650 (45.0) | 48,013 (44.5) | |
| Second | 48,013 (44.5) | 48,650 (45.0) | |
| Unknown | 11,375 (10.5) | 11,375 (10.5) | |
| Methods of delivery | 0.88 | ||
| C-section | 71,046 (65.8) | 70,883 (65.6) | |
| Vaginal | 29,913 (27.7) | 30,076 (27.8) | |
| Unknown | 7079 (6.6) | 7079 (6.6) |
