Table 3.

Factors Predicting Infection

	Univariate model				Multivariate model
	P value	HR	95% CI for HR		P value	HR	95% CI for HR
			Lower	Upper			Lower	Upper
>65 years age	0.012	3.532	1.315	9.487	0.049	3.378	1.004	11.369
Renopulmonary involvement	0.005	2.439	1.301	4.574	0.002	4.954	1.804	13.605
ANCA positivity	0.034	2.586	1.076	6.208	0.722	0.788	0.213	2.918
CRP (per 1 mg/L increase))	0.003	1.006	1.002	1.010	0.043	1.006	1.000	1.011
Cumulative glucocorticoid dose	0.023	0.972	0.949	0.996	0.767	1.007	0.961	1.055
History of plasmapheresis	0.050	2.204	1.001	4.853	0.454	1.623	0.456	5.776

(abbreviations: CRP: C-reactive protein, ANCA: antineutrophil cytoplasmic antibodies)