Table 2 Results of the univariate analysis (n = 53), Elementary School, January 2012

Consumption of tap water from the school

32

45

71.1

20

66

30.3

2.35

1.56-3.54

Consumption of bottled water

27

77

35.1

25

35

71.4

0.49

0.34-0.71

Consumption of water from the cooler in the teaching staff room

5

11

45.5

47

100

47.0

0.97

0.49-1.91

Another person at approximate environment with gastroenteritis symptoms before the onset of symptoms

25

31

80.7

28

42

66.7

1.21

0.92-1.59

Participation in tutorial lessons (after school)

16

33

48.5

36

73

49.3

0.98

0.64-1.50

Participation in athletic activities

11

23

47.8

41

83

49.4

0.97

0.60-1.56

Visit to playground

1

2

50.0

51

104

49.04

1.02

0.25-4.13