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Table 2 Characteristics of included studies

From: Incubation period of typhoidal salmonellosis: a systematic review and meta-analysis of outbreaks and experimental studies occurring over the last century

  N %
Total number of studies 13  
Year of study
 Before year 2000 8 61.5
 2000 and later 4 30.8
 unknown 1 7.7
Region of study
 Europe 3 23.1
 North America 5 38.5
 Africa 2 15.4
 Asia 2 15.4
 Unknown 1 7.7
Study design
 Descriptive 4 30.8
 Case control 4 30.8
 Retrospective cohort 3 23.1
 Experimental study 2 15.4
Setting of exposure
 Catered meal 5 38.5
 Outdoor activity 2 15.4
 Picnic 2 15.4
 Experimental study 2 15.4
 Community 1 7.7
 Restaurants 1 7.7
Food vehicle category
 Red meat 2 15.4
 Dairy and dairy products 2 15.4
 Salad 3 23.1
 Non-foodborne 1 7.7
 Other 3 23.1
 Unknown 2 15.4