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Table 2 Cox univariate analysis of confirmed cases by demographic, clinical and exposure factors, Nigeria 2019, (n = 389)

From: Factors associated with delayed presentation to healthcare facilities for Lassa fever cases, Nigeria 2019: a retrospective cohort study

Characteristic

Stratum

Hazard ratio

Crude 95% CI

Crude p-value

Proportional Hazard test of assumption

Sex

Male

Ref

0.97

0.28

Female

1.10

0.82–1.23

  

Age (per year)

 

1.00

0.99–1.01

0.95

0.05

Age group (years)

0–4

Ref

0.76

0.11

5–12

1.08

0.60–1.89

  

13–17

1.25

0.71–2.21

  

18–25

0.91

0.55–1.53

  

26–59

0.97

0.61–1.53

  

60+

1.11

0.63–1.96

  

Mortality status

Dead

Ref

  

Alive

0.97

0.73–1.28

0.81

0.45

Rurality

Rural

Ref

0.34

0.37

Semi-urban

1.39

0.79–2.46

Urban

1.15

0.89–1.49

Malaria prevalence category

0–11%

Ref

0.37

0.88

12–21%

0.98

0.36–2.71

22–29%

4.15

0.74–23.44

30–36%

1.00

0.36–2.83

37–64%

0.85

0.28–2.64

Education status

Primary

Ref

0.38

0.97

Secondary

1.44

0.81–2.55

Tertiary

1.1

0.63–1.91

Occupation group

Not working or retired

Ref

0.95

0.65

Student or Child or Apprentice

1.13

0.57–2.23

Housewife

0.89

0.42–1.88

Farmer

1.21

0.58–2.54

Casual labourer

1.26

0.16–10.02

Transporter

0.91

0.30–2.72

Religious or Traditionala

1.45

0.51–4.10

Artisan

1.15

0.47–2.78

Business or Professionala

1.10

0.55–2.18

Health Worker

1.47

0.61–3.55

Symptom severity

Mild

Ref

0.90

0.61

Severe

1.03

0.65–1.63

  

Exposure to rodents

No

Ref

0.69

0.82

Yes

1.23

0.45–3.34

  

Exposure to confirmed case

No

Ref

0.77

0.93

Yes

0.94

0.64–1.38

  

History of Travel

No

Ref

0.76

0.26

Yes

1.04

0.81–1.34

  

Attended a funeral

No

Ref

0.79

0.35

Yes

0.65

0.09–4.68

  

Participated in a funeral (touched body)

No

Ref

0.92

0.64

Yes

1.05

0.38–2.90

  
  1. a Business or professional: A business person here refers to one who earns profit by supplying goods and services while a professional refers to someone with specified qualifications or expertise who gets paid for rendering services. Religious or Traditional: Traditional healers use indigenous plants, herbs and the root of plants to heal sick people while religious healer use prayers predominantly to heal sick people