Table 3.

Association of HFMD epidemic for the number of KD patients with resistance to the initial IVIG therapy.

	IRR	95% CI	P-value
The mean weekly number of HFMD cases from each sentinel medical facility	0.92	0.86–0.99	0.049

Incidence rate ratios (IRR) of the mean weekly number of HFMD cases from each sentinel medical facility (n = 24) for the resistance to the initial IVIG therapy were estimated by Poisson regression in which the number of the development of KD was used as off-set.

IRR, incident rate ratio; CI, confidence interval; IVIG, intravenous immunoglobulin; HFMD, hand-foot-mouth disease.