Table 2. Age stratification versus median RHS score (IQR).

	n	< 5 years	n	5–14.9 years	n	≥ 15 years	Groups validity (p value)a
Total population	36	12 (7, 17)	78	11 (6, 27)	24	16 (3, 43)	0.832
SMA 2	31	10 (6, 13)	48	7 (5, 11)	10	2 (2, 3)	< 0.001**
SMA 3a	4	43 (35, 49)	29	35 (25, 50)	7	33 (20, 47)	0.619
SMA 3b	1	68	1	61	7	47 (31, 60)	0.187
Non-ambulant	31	10 (6, 13)	62	9 (5, 20)	13	3 (2, 6)	0.007*
Ambulant	5	45 (41, 52)	16	51 (44, 63)	11	47 (33, 57)	0.463

*significant,

**highly significant,

^aKruskal Wallis