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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).