Table 1.
Study group characteristics.
| SMA (N = 79) | Controls (N = 30) | |
|---|---|---|
| Age [year], median (IQR) | 31 (17–43) | 30 (17–44) |
| Age of onset [year], median (IQR) | 1 (0–3) | |
| Disease duration [year], median (IQR) | 28 (15–37) | |
| Sex, N (%) | ||
| Female | 41 (52) | 18 (60) |
| Male | 38 (48) | 12 (40) |
| SMA type, N (%) | ||
| 1 | 7 (9) | |
| 2 | 33 (42) | |
| 3 | 39 (49) | |
| SMN2 copy number, N (%) | ||
| 2 | 9 (16) | |
| 3 | 31 (53) | |
| 4+ | 18 (31) | |
| Unknown | 21 | |
| Weight [kg], median (IQR) | 50 (33–65) | |
| Height [cm], median (IQR) | 158 (145–170) | |
| BMI [kg/m2], median (IQR) | 20.5 (16.1–23.4) | |
| Scoliosis, N (%) | ||
| Present | 50 (63) | |
| Not present | 29 (37) | |
| Spondylodesis, N (%) | ||
| Present | 24 (30) | |
| Not present | 55 (70) | |
| Wheelchair‐use, N (%) | ||
| Never | 9 (11) | |
| Occasionally | 6 (8) | |
| Permanently | 64 (81) | |
| Mobility, N (%) | ||
| Never able to walk | 40 (51) | |
| Lost ability to walk | 24 (30) | |
| Still able to walk | 15 (19) | |
IQR, interquartile range; BMI, body mass index; SMN2, Survival of motor neuron 2 gene.