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Number and percentage of participants with PWS who were co-twins.
| Patients | PWSA (USA) N (%) |
RDCRN N (%) |
UCIMC N (%) |
TOTAL N (%) |
Expected U.S. Twin Frequency (%) (Hoekstra, Zhao et al. 2008) |
|---|---|---|---|---|---|
| Twins | 42 (2.4) | 1 (0.1) | 2 (4.0) | 45 (2.4) | (1.6) |
| Singletons | 1,698 (97.6) | 107 (99.9) | 48 (96.0) | 1,853 (97.6) | (98.4) |
| Total | 1,740 (100.0) | 108 (100.0) | 50 (100.0) | 1,898 (100.0) | (100.0) |
key: chi-square=7.162 1 df p=0.007
