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Table 1 Mean number of cases per outbreak by season and period

From: Secular trends in 1,192 diarrheal outbreaks in the Israel Defence Forces between 1988–2011

Period

Years

Summer

Winter

r summer/winter

1

’88-’91

34.1

35.7

0.96

2

’92-’95

34.5

21.2

1.63

3

’96-’99

34.7

35.4

0.98

4

’00-’03

40.9

27.7

1.48

5

’04-’07

35.6

43.3

0.82

6

’08-’11

42.1

39.0

1.08

  1. (r-ratio).