Skip to main content

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

 Â