Table 3.

Results of multifactorial logistic analysis with step-wise factor selection

Model fit χ2 53.59, p < 0.0001
Parameter		Estimate	Wald Chi-square	Pr > χ2	Odds ratio	95% Wald confidence limits
Intercept		− 1.37	22.85	< 0.0001
SMN2 copies (≤ 3 vs. 4)	1	0.69	5.31	0.021	2.00	0.64	6.74
Sex (male vs. female)	2	0.70	6.25	0.012	2.02	1.16	3.49
Disease duration*	3	0.08	47.69	< 0.0001	1.1	1.06	1.20

*Disease duration = the interval between the onset and the last follow-up