Table 2.

Serogroups and toxins as risk factors for HUS in 256 STEC positive patients using binary logistic regression model

	HUS (56)	STEC without HUS (200)	OR (95% CI)	p value	Adjusted OR*	p value
Serogroup O157	37 (66%)	103 (52%)	1.83 (0.99–3.41)	NS	2.14 (1.11–4.12)	0.02
Serogroup O26	6 (11%)	20 (10%)	1.08 (0.41–2.83)	NS	1.12. (0.41–3.19)	NS
Serogroup O121	4 (7%)	4 (2%)	3.77 (0.91–15.58)	NS	2.66 (0.61–11.60)	NS
Stx1(with or without Stx2)	5 (9%)	118 (59%)	0.07(0.03–0.19)	< 0.001	0.07 (0.03–0.18)	< 0.001
Stx1 alone	2 (4%)	54 (27%)	0.10 (0.02–0.43)	0.002	0.09 (0.02–0.39	0.001
Stx1a	4 (7%)	108 (54%)	0.07 (0.03–0.19)	< 0.001	0.07 (0.02–0.19)	< 0.001
Stx2 (with or without Stx1)	54 (96%)	147 (74%)	9.74 (2.29–41.33)	0.002	11.03 (2.56–47.53)	0.001
Stx2 alone	51 (91%)	82 (41%)	14.68 (5.62–38.36)	< 0.001	14.84 (5.62–39.20)	< 0.001
Stx2a	51 (91%)	76 (38%)	16.64 (6.36–43.54)	< 0.001	17.41 (6.55–46.27)	< 0.001
Stx2c	1 (2%)	56 (28%)	0.05 (0.01–0.35)	0.003	0.47 (0.06–4.00)	NS
Stx1 and Stx2	3 (5%)	65 (33%)	0.12 (0.04–0.39)	< 0.001	0.12 (0.04–0.42)	0.001
eae	52 (93%)	172 (86%)	2.12 (0.71–6.31)	NS	1.92 (0.63–5.81)	NS

CI confidence interval, NS nonspecific, OR odds ratio, aOR adjusted odds ratio with confidence intervals for age groups < 3 and ≥ 3 years and sex