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Table 1 Comparison of major risk factors between cases and controls

From: Protective effect of exclusive breastfeeding against hand, foot and mouth disease

Factor

Control (n = 566) n (%)

Case (n = 316) n (%)

P value *

Age (yrs)

1.6

1.7

0.01

  < 6 m

125(22.1)

49(15.5)

 

  6-12 m

93(16.4)

60(19.0)

 

  13-18 m

97(17.1)

50(15.8)

 

  19-24 m

75(13.3)

51(16.1)

 

  25-28 m&

41(7.2)

32(10.1)

 

  29-48 m

135(23.9)

74(23.4)

0.12

Height (cm)

75.9

79.5

0.10

Weight (kg)

11.0

11.3

0.25

Sex

   

  Male

329(58.1)

200(63.3)

 

  Female

237(41.9)

116(36.7)

0.15

Breastfeeding type

   

  Mixed

250(44.2)

180(57.0)

 

  Exclusive breastfeeding

316(55.8)

136(43.0)

0.004

Went to see a doctor

   

  No

518(94.5)

296(93.7)

 

  Yes

30(5.5)

20(6.3)

0.74

Went to visit a patient

   

  No

458(83.6)

255(80.7)

 

  Yes

90(16.4)

61(19.3)

0.33

Hand-washing before dinner

   

  Yes

435(78.8)

182(58.0)

 

  No

117(21.2)

132(42.0)

0.001

Hand-washing after toilet use

   

  Yes

375(70.0)

182(58.7)

 

  No

161(30.0)

128(41.3)

0.001

Hand-washing before contacting child

   

  No

207(38.6)

170(55.6)

 

  Yes

329(61.4)

136(44.4)

0.001

Went to indoor playground

   

  No

462(84.5)

226(71.5)

 

  Yes

85(15.5)

90(28.4)

0.001

Went to outdoor playground

   

  No

441(80.6)

206(65.2)

 

  Yes

106(19.4)

110(34.8)

0.001

House trash

   

  No

515(91.0)

239(75.6)

 

  Yes

51(9.0)

77(24.4)

0.001

Monthly household income (RMB)

   

  <10 k

281(84.4)

153(85.5)

 

  ≥10 k

52(15.6)

26(14.5)

0.84

House crowding (person/100 m2)

6.3

6.9

0.14

  1. *χ2 test for categorical variables and t test for continuous variables.