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Table 2 Univariate logistic regression analyses of potential risk factors

From: A case-control study on the risk factors for hemorrhagic fever with renal syndrome

Variable

Cases

Controls

P-value

OR (95% CI)

n(%)

n(%)

Education level

 Primary school and below

51 (59.3)

86 (50.0)

0.101

0.595 (0.320–0.108)

 Above the primary school

35 (40.7)

86 (50.0)

  

Having underlying diseases

 Yes

5 (5.8)

13 (7.6)

0.585

0.733 (0.240–2.239)

 No

81 (94.2)

159 (92.4)

  

Household income (RMB)

 ≤30,000

53 (61.6)

81 (47.1)

0.009

0.413 (0.212–0.804)

 > 30,000

33 (38.4)

91 (52.9)

  

House near pond

 Yes

38 (44.2)

70 (40.7)

0.533

1.264 (0.606–2.635)

 No

48 (55.8)

102 (59.3)

  

Cleaning spare rooms at home

 Yes

62 (72.1)

90 (52.3)

0.001

3.280 (1.653–6.512)

 No

24 (27.9)

82 (47.7)

  

Sprinkling while cleaning spare rooms at home

 Yes

9 (25.7)

37 (54.4)

0.418

0.549 (0.128–2.344)

 No

26 (74.3)

31 (45.6)

  

Presence of rats at home

 Yes

50 (58.1)

76 (44.2)

0.013

2.278 (1.188–4.366)

 No

36 (41.9)

96 (55.8)

  

Rodent control measures at home

 Yes

26 (30.2)

73 (42.4)

0.028

0.472 (0.242–0.921)

 No

60 (69.8)

99 (57.6)

  

Presence of rats in the working areas

 Yes

19 (22.1)

35 (20.3)

0.703

1.156 (0.548–2.438)

 No

67 (77.9)

137 (79.7)

  

Rodent control measures in the working areas

 Yes

2 (2.3)

25 (14.5)

0.008

0.064 (0.008–0.492)

 No

84 (97.7)

147 (85.5)

  

Contacting with rats and/or their excreta

 Yes

8 (9.3)

18 (10.5)

0.752

0.858 (0.332–2.216)

 No

78 (90.7)

154 (89.5)

  

Raising cats

 Yes

12 (14.0)

46 (26.7)

0.011

0.378 (0.179–0.797)

 No

74 (86.0)

126 (73.3)

  

Raising dogs

 Yes

30 (34.9)

80 (46.5)

0.054

0.562 (0.313–1.011)

 No

56 (65.1)

92 (53.5)

  

Raising chickens

 Yes

32 (37.2)

83 (48.3)

0.041

0.511 (0.268–0.973)

 No

54 (62.8)

89 (51.7)

  

Raising ducks

 Yes

5 (5.8)

26 (15.1)

0.012

0.143 (0.031–0.654)

 No

81 (94.2)

146 (84.9)

  

Raising gooses

 Yes

4 (4.7)

3 (1.7)

0.199

2.667 (0.597–11.975)

 No

82 (95.3)

169 (98.3)

  

Airing quilts

 Frequent(≥4 times per week)

59 (68.6)

142 (82.6)

0.004

0.328 (0.155–0.694)

 Infrequent(< 4 times per week)

27 (31.4)

30 (17.4)

  

Proper storage of food and crops

 Yes

24 (27.9)

67 (39.0)

0.028

0.442 (0.214–0.916)

 No

62 (72.1)

105 (61.0)

  

Heat leftovers before eating

 Yes

64 (74.4)

111 (64.5)

0.054

1.975 (0.987–3.951)

 No

22 (25.6)

61 (35.5)

  

Resting on a grass field

 Yes

7 (8.1)

6 (3.5)

0.066

4.464 (0.906–23.821)

 No

79 (91.9)

166 (96.5)

  

Farming with broken skins

 Yes

2 (2.3)

8 (4.7)

0.381

0.500 (0.106–2.355)

 No

84 (97.7)

164 (95.3)

  

Mite bites

 Yes

3 (3.5)

6 (3.5)

1.000

1.000 (0.250–3.998)

 No

83 (96.5)

166 (96.5)

  
  1. All exposure factors were within the previous 1 month prior to disease onset
  2. OR Odds ratio, CI Confidence interval