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Table 4 Linear regression analysis to identify factors associated with the distribution of incubation period

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

Variables Univariate analysis Multivariable analysis
  Difference in mean p-value Difference in mean p-value
Age distribution
 Adult Reference    
 Children 2.7 0.6   
 Mixed ages 1.5 0.6   
Year of study
 Pre 1950 Reference    
 Post 1950 6.8 0.01 −3.9 0.1
Attack rate −0.14 0.05 −0.26 0.07
Setting
 Restaurant Reference    
 Catered meal −0.5 0.9   
 Community −8.3 0.1   
 Experimental −7.4 0.2   
 Outdoor activity 1.5 0.8   
 Picnic −6.9 0.2   
Food category
 Other Reference    
 Dairy −4.3 0.3   
 Non-food 3.1 0.6   
 Red meat 0.1 0.9   
 Salad & vegetable 3.3 0.5   
Vaccine history
 None Reference    
 Yes 10.3 0.03 4.2 0.1
Specific case definition
 No Reference    
 Yes −2.2 0.4