| SRS-compatible | Non-SRS | Non-SRS with microcephaly | Total | ||
|---|---|---|---|---|---|
| n = 148 | n = 94 | n = 7 | n = 249 | ||
| Genetic causes of SRS | 45 (30.4%) | 13 (13.8%) | 0 | ||
| H19LOM | 38 | 9 | 0 | 47 | 58/249 (23.3%) |
| UPD(7)mat | 7 | 4 | 0 | 11 | |
| Imprinting disorders other than H19LOM and UPD(7)mat | 21 (14.2%) | 7 (7.4%) | 1 (14.3%) | ||
| Temple syndrome | 8 | 3 | 11 | 29/249 (11.6%) | |
| UPD(20)mat | 4 | 1 | 5 | ||
| UPD(6)mat | 1 | 2 | 3 | ||
| Prader-Willi syndrome | 2 | 1 | 3 | ||
| 11p15 maternal duplication | 2 | 1 | 3 | ||
| UPD(16)mat | 2 | 2 | |||
| Parthenogenesis | 1 | 1 | |||
| UPD(11)mat mosaic | 1 | 1 | |||
| Unknown | 82 (55.4%) | 74 (78.7%) | 6 (85.7%) | 162/249 (65.1%) | |
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