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Table 1 Main characteristics of studies included in the meta-analysis (N = 35)

From: Incidence of acute diarrheal illness in Chinese communities: a meta-analysis

Variable No. of studies (n) Proportion (% = n/N)
Time perioda
 1980–1989 11 31
 1990–1999 3 8
 2000–2012 19 53
 Unknown 3 8
Study area   0
 Rural 17 49
 Urban 4 11
 Rural+urban (combined) 14 40
 East 19 54
 Central 3 9
 West 10 29
 Multi-province 2 6
 Unknown 1 3
 North 8 23
 South 24 69
 Multi-province 2 6
 Unknown 1 3
Survey mode   0
 Face-to-face survey 34 97
 Telephone survey 1 3
Season   0
 Spring 1 3
 Summer 16 46
 Autumn 1 3
 Winter 2 6
 Multi-season 14 40
 Unknown 1 3
  1. aone study was conducted from 1986 to 1996, and we divided it into 1980–1989 and 1990–1999. Spring: March, April, and May; summer: June, July, and August; autumn: September, October, and November; winter: December, January, and February