Table 6.

Univariate logistic regression analysis of risk factors for treatment efficacy (n)

Group	Case	Age of onset >40 years old	Respiratory muscle involvement	Cranial nerve involvement	Concomitant lung infection	IVIG treatment > two weeks from onset	Isolation pretreatment on cerebrospinal fluid protein
Valid	41	23	3	25	4	8	27
Invalid	17	9	6	11	10	10	11
χ2		0.001	5.200	0.010	12.34	10.074	0.002
P		0.980	0.023	0.975	0.000	0.002	0.966

Note: IVIG, intravenous gammaglobulin.