Infantilea SMA Patients (n=23)	Infantile Matched Non-SMA Patients (n= 23)	Childhood Onsetb SMA Patients (n=22)	Childhood Onset-Matched Non-SMA Patients (n= 22)	Late Onsetc SMA Patients (n=296)	Late Onset-Matched Non-SMA Patients (n= 296)
Length of post-index follow-up, months mean (SD), median	11.0 (± 9.58), 8.0	23.8 (± 18.50), 18.6	27.7 (± 23.37), 24.0	33.5 (± 32.04), 21.1	36.0 (± 26.50), 29.6	36.3 (± 29.81), 28.6
Mean time from index date to death, months (SD), median	6.7 (± 6.11), 4.3	N/A	19.1 (N/A), 19.1	N/A	26.2 (± 19.75), 20.3	36.4 (± 23.13), 32.6
Total mortality, %
0 – 6 months post-index	13.0%	0.0%	0.0%	0.0%	1.4%	0.0%
7 – 12 months post-index	0.0%	0.0%	0.0%	0.0%	0.0%	0.0%
13 – 18 months post-index	4.3%	0.0%	0.0%	0.0%	1.0%	0.7%
19 – 24 months post-index	0.0%	0.0%	0.0%	0.0%	0.7%	0.3%
25 – 36 months post-index	0.0%	0.0%	4.5%	0.0%	0.3%	0.3%
36 months after post-index period	0.0%	0.0%	0.0%	0.0%	2.0%	1.0%