Table 1.

Summary of demographic patient characteristics.

	SMA	SMA 1	SMA 2	SMA 3
N	60	2	28	30
Gender (% males)	55	50	46	63
Age (y)	31.9 (7–60)	7; 15	26.1 (11–48)	38.7 (15–60)
HFMSE			2 (0–8)	24 (0–66)
CHOP INTEND		22; 26
LP (% CT-guided)	65	50	100	33
Spinal hardware	19	1	16	2
Severe scoliosis	18	0	11	7
Obesity*	2	0	1	1

Age in mean (range); HFMSE in median (range). SMA, spinal muscular atrophy; N, number of patients; y, years; HFMSE, Hammersmith Functional Rating Scale Expanded; CHOP INTEND, Children‘s Hospital of Philadelphia Infant Test of Neuromuscular Disorders; LP, lumbar puncture.

^*Marked obesity making conventional LP impossible.