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Table 3 Alternative Poisson regression models for the relationship with time since injury, involving effect modificationsa

From: Modelling memory decay after injuries using household survey data from Khartoum State, Sudan

Relationship with time since injury

Factor included in effect modification of time since injury

Number of parameters in model

Akaike information criterion (AIC)

Likelihood ratio χ2 for effect modification

Degrees of freedom (DF)

Log-quadratic

Sex

15

5668.64

2.79

2

Log-quadratic

Age

17

5674.47

0.96

4

Log-quadratic

Urban/rural status

15

5668.55

2.88

2

Log-quadratic

Education

19

5672.47

6.96

6

Log-quadratic

Socioeconomic status

17

5665.23

10.20

4

Log-cubic

Socioeconomic status

20

5670.66

10.73

6

Log-linear

Socioeconomic status

14

5675.88

0.79

2

Log-quadratic in lower socioeconomic tertile, log-linear otherwise

Socioeconomic status

15

5661.39

  
  1. aData included for reported injuries in months 1–11 before interview. All models incorporate main effects of sex, age, urban/rural status, education and socioeconomic status, in addition to a random household effect