TABLE 2.

Multivariate analysis of epidemiologic characteristics of ST23 cases compared to ST1, ST47 and other STs

Characteristic	ST23 vs. ST1 (n = 345)	p	ST23 vs. ST47 (n = 359)	p	ST23 vs. other STs (n = 960)	p
	IRR (95% CI)		IRR (95% CI)		IRR (95% CI)
Male	1.08 (0.92–1.26)	0.35	1.02 (0.86–1.20)	0.81	1.06 (0.80–1.40)	0.67
Age (years) (mean/variable)	1.00 (0.99–1.0)	0.81	1.00 (0.99–1.00)	0.46	1.00 (0.99–1.00)	0.85
Risk factor
Cancer	0.75 (0.55–1.03)	0.07	0.93 (0.70–1.24)	0.62	0.81 (0.53–1.24)	0.33
Steroid therapy	0.56 (0.35–0.90)	0.016*	0.68 (0.43–1.09)	0.11	0.56 (0.31–1.02)	0.06
Diabetes	1.05 (0.91–1.21)	0.55	0.99 (0.82–1.18)	0.87	1.09 (0.82–1.45)	0.58
Tobacco	1.04 (0.92–1.17)	0.58	1.11 (0.95–1.31)	0.19	0.99 (0.77–1.26)	0.91
Exposure
Hospital-acquired infection	0.32 (0.16–0.63)	0.001*	1.49 (1.03–2.14)	0.034*	0.69 (0.34–1.41)	0.31
Travel	0.97 (0.79–1.17)	0.73	0.89 (0.70–1.13)	0.34	0.66 (0.47–0.95)	0.023*
Elderly setting	0.95 (0.64–1.40)	0.78	1.69 (1.31–2.20)	<10−3	1.54 (0.88–2.70)	0.13
Region		<10−3a		<10−3a,*		0.003a
1	Ref.		Ref.		Ref.
2	1.14 (0.71–1.81)	0.60	0.68 (0.43–1.08)	0.10	0.44 (0.24–0.80)	0.007*
3	1.85 (1.38–2.47)	<10−3*	0.88 (0.67–1.14)	0.33	1.12 (0.77–1.64)	0.56
4	1.61 (1.20–2.16)	0.001*	1.43 (1.12–1.83)	0.004*	1.17 (0.80–1.70)	0.42
5	1.95 (1.47–2.60)	<10−3	1.30 (0.94–1.76)	0.11	0.73 (0.41–1.28)	0.27

ST, sequence type; IRR, incidence rate ratio; CI, confidence interval; Ref., reference.

*Statistically significant.

^aGlobal test.