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Table 1 Association between patient-related factors in O157 versus non-O157 and HUS versus non-HUS STEC infections, Norway 1992–2012

From: Shiga toxin-producing escherichia coli infections in Norway, 1992–2012: characterization of isolates and identification of risk factors for haemolytic uremic syndrome

Characteristics No. (%) of patients
   All (333) O157 (112, 33.6 %) Non-O157 (221, 66.4 %) p-valuea HUS (25, 7.5 %) Non-HUS (308, 92.5 %) p-value
Sex Male 146 (43.8 %) 47 99   9 137  
Female 187 (56.2 %) 65 122   16 171  
Age group (yr) ≤5 130 (39.0 %) 25 105 <0.005 22 108 <0.005
6-18 41 (12.3 %) 16 25   2 39  
19-41 76 (22.8 %) 30 46   0 76  
42-64 51 (15.4 %) 23 28   0 51  
≥65 35 (10.5 %) 18 17   1 34  
Age mean   24.6 33.9 20.33 <0.005 4.72 26.2 <0.005
HUS Yes 25 (7.5 %) 9 16   25 0  
No 308 (92.5 %) 103 205   0 308  
Clinical outcome Bloody diarrhea 119 (35.7 %) 40 79   13 106 <0.005
Diarrhea 148 (44.4 %) 57 91   1 147 <0.005
Asymptomatic 9 (2.7 %) 0 9   0 9  
Unknown 57 (17.1 %) 15 42   11 46  
Hospitalized Yes 141 (42.2 %) 64 77   24 117  
No 155 (46.4 %) 39 116 <0.005 0 155 <0.005
Unknown 37 (11.1 %) 9 28   1 36  
Travel history Domestically 166 (49.8 %) 40 126   16 150  
Imported 107 (32.1 %) 57 50 <0.005 3 104  
Unknown 60 (18.0 %) 15 45   6 54  
Seasonalityb Summer 118 (35.4 %) 50 68   6 112  
Autumn 74 (22.2 %) 20 54   9 65  
Winter 75 (22.5 %) 24 51   7 68  
Spring 66 (19.8 %) 18 48   3 63  
  1. aOnly p-values ≤ 0.05 were shown
  2. bSummer; June-August, Autumn; September-November, Winter; December-February, Spring; March-May