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

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

Seasonality^b

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