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SMA患儿的临床特征[例（%）或M（P25，P75）]
| 分型 | 例数 | 性别 (男:女) |
发病年龄（月） | 首发症状 | |||
| 肌无力 | 呼吸窘迫 | 步态异常 | 生长发育迟缓 | ||||
| Ⅰ型 | 10 | 6 : 4 | 4.5(3.8, 6.0) | 6(60) | 3(30) | 0 | 1(10) |
| Ⅱ型 | 26 | 12 : 14 | 12.0(9.0, 14.0) | 15(58) | 4(15) | 4(15) | 3(12) |
| Ⅲ型 | 9 | 6 : 3 | 40.0(30.0, 75.0) | 5(56) | 0 | 2(22) | 2(22) |
| 合计 | 45 | 24 : 21 | 12.0(7.0, 18.0) | 26(58) | 7(16) | 6(13) | 6(13) |
