Table 1 Participant’s background characteristics (n = 137)

Sex

Male

65

47.4

Female

72

52.6

Age group

16 ~ 20

26

19

21 ~ 30

67

48.9

> 30

44

32.1

Family registry

Urban

115

83.9

Rural

22

16.1

Type of SMA

Type 1

58

42.3

Type 2

76

55.5

Type 3

3

2.2

Determination of SMN2 copy number

Yes

78

56.9

No

29

21.2

Not clear

30

21.9

Duration (year), mean (SD) [range]

14.9 (10.7)

[1 ~ 46]