All Island Voluntary Registry of Twins & Multiples
| Same Sex Male | Same Sex Female | Different Sex | M / Unknown | F / Unknown | Total | |
| Twin Pairs | 2239 | 2748 | 1640 | 10 | 15 | 6652 |
| Triplets | 20 | 34 | 48 | 0 | 0 | 102 |
| Quadruplets | 0 | 04 | 04 | 0 | 0 | 04 |
Twins in the Colombo District (Population Based)
| Same Sex Male | Same Sex Female | Different Sex | Gender Unknown | Total | |
| Twin Pairs & Triplets | 3150 | 3370 | 2460 | 636 | 9616 |