Table 3 Bivariate and multivariable logistic regression analysis on factors associated with IPIs among asymptomatic food handlers at HU, eastern Ethiopia from August 2015 to January 2016

Sex

Female

0.97 [0.57, 1.68]

1

–

Male

Age (in years)

>  40

2.11 [0.54, 7.00]

1.79 [0.97, 3.31]

1.05 [0.57, 1.93]

1

1.61 [0.44, 5.88]

1.77 [0.89, 3.51]

0.92 [0.48, 1.79]

1

31–40

21–30

<  21

Formal education

No

2.11 [1.29, 3.43]

1

2.13 [1.24, 3.67]*

1

Yes

Years of service (in years)

>  10

2.01 [1.17, 3.47]

1.42 [0.73, 2.73]

1

1.66 [0.91, 3.03]

1.57 [0.78, 3.20]

1

5–10

<  5

Average monthly income (in USD)

< 45.7

3.78 [1.66, 8.58]

3.15 [0.99, 10.07]

1.88 [0.54, 6.48]

1

3.86 [1.62, 9.20]*

3.22 [0.91, 11.43]

1.87 [0.50, 6.99]

1

45.7–91.3

91.4–137

> 137

Ownership of cafeteria

Private

0.74 [0.41, 1.35]

–

HU

Hand washing before food preparing with a soap

No

1.29 [0.79, 2.11]

1

–

Yes

Hand washing after touching body parts

No

1.62 [1.03, 2.54]

1

1.33 [0.81, 2.18]

1

Yes

Use of apron when handling food

No

1.51 [0.96, 2.37]

1

1.37 [0.83, 2.27]

1

Yes

Hand washing after toilet with a soap

No

2.48 [1.32, 4.68]

1

2.43 [1.22, 4.86] *

1

Yes

Fingernail trimming

No

3.39 [2.14, 5.36]

1

3.31 [1.99, 5.49] *

1

Yes

Hand washing before eating food with a soap

No

0.59 [0.69, 1.90]

1

–

Yes

Medical check-up (in the last 6 months)

No

1.59 [0.93, 2.73]

1

1.43 [0.79, 2.57]

1

Yes

Food safety training

No

1.10 [0.62, 1.64]

1

–

Yes