N

%

Unadjusted

Adjusted

Cases

Controls

Cases

Controls

OR（95% CI）

P value

OR（95%CI）

P value

Female

26

37

44

51

0.75 (0.37 - 1.49)

0.40

Well water

51

37

86

52

6.03 (2.34 - 16.0)

0.01

6.14 (2.46 - 18.2)

0.01

Bottled water

40

38

68

53

1.88 (0.87 - 4.11)

0.08

Tap water

20

34

34

47

0.57 (0.26 - 1.24)

0.12

0.36 (0.18 - 0.74)

0.04

Eating out

18

24

31

33

0.88 (1.42 - 1.84)

0.73

Buy food in local market

38

41

64

57

1.37 (0.67 - 2.78)

0.39