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Table 2 Subhazard ratio (SHR) obtained from the Fine-Gray models for short and long IBIs

From: Examining internal migration effects on short versus long interbirth intervals in Cotonou, Benin Republic

 

Short interbirth intervals

Long interbirth intervals

Model 1

Model 2

Model 3

Model 1b

Model 2b

Model 3b

Migration

 Non-migrant (Ref.)

1

1

 

1

1

 

 Migrant

   < 5 years in Cotonou

1.71*** (1.33–2.21)

1.60*** (1.23–2.08)

 

0.64*** (0.47–0.87)

0.67** (0.50–0.91)

 

  5–10n years in Cotonou

0.97 (0.76–1.24)

0.90 (0.69–1.16)

 

0.95 (0.78–1.16)

0.98 (0.80–1.21)

 

   > 10 years in Cotonou

0.99 (0.81–1.21)

0.97 (0.78–1.19)

 

1.02 (0.89–1.18)

1.06 (0.92–1.23)

 

Migration * Reason for migration

 Non-migrant (Ref.)

  

1

  

1

 In-migrant

      

   < 5 years in Cotonou

   For job or school reason

  

1.52** (1.03–2.26)

  

0.67* (0.43–1.06)

   Neither for job nor for school reason

  

1.59**(1.11–2.28)

  

0.67* (0.45–1.01)

  5–10 years in Cotonou

   For job or school reason

  

1.13 (0.81–1.59)

  

1.03 (0.80–1.31)

   Neither for job nor for school reason

  

0.67** (0.46–0.98)

  

0.89 (0.60–1.31)

   > 10 years in Cotonou

   For job or school reason

  

1.16 (0.88–1.53)

  

1.03 (0.85–1.25)

   Neither for job nor for school reason

  

0.74* (0.54–1.02)

  

1.12 (0.89–1.40)

Education

 No education (Ref.)

 

1

1

 

1

1

 Primary

 

0.81** (0.66–1.00)

1.58*** (1.20–2.09)

 

1.08 (0.91–1.27)

0.85 (0.69–1.05)

 Secondary or higher

 

0.71*** (0.57–0.90)

0.80** (0.65–0.99)

 

1.15* (0.98–1.36)

1.07 (0.91–1.27)

Employment

 Employed (Ref.)

 

1

1

 

1

1

 Unemployed

 

1.26*** (1.07–1.50)

0.71*** (0.56–0.90)

 

0.86** (0.75–0.99)

1.15* (0.98–1.36)

Ideal number of children

 1–3 children (Ref.)

1

1

 

1

 

1

  > 3 children

1.24** (1.01–1.52)

1.25** (1.02–1.54)

 

0.83*** (0.72–0.95)

 

0.82*** (0.71–0.95)

Modern contraceptive use

 User

1.02 (0.80–1.30)

1.00 (0.78–1.28)

 

0.97 (0.79–1.19)

 

0.97 (0.79–1.19)

 Non-user (Ref.)

1

1

 

1

 

1

Religion

 Muslim

1.31** (1.04–1.65)

1.33** (1.06–1.67)

 

0.91 (0.75–1.10)

 

0.91 (0.75–1.11)

 Non-Muslim (Ref.)

1

1

 

1

 

1

Marital status

 Married (Ref.)

1

1

 

1

 

1

 Unmarried

1.70*** (1.37–2.12)

1.69*** (1.36–2.11)

 

0.69*** (0.58–0.83)

 

0.69*** (0.58–0.83)

Mother’s age at birth index

1.01 (0.99–1.03)

1.03*** (1.01–1.05)

1.03*** (1.01–1.05)

1.02*** (1.01–1.04)

1.01 (1.00–1.03)

1.01 (1.00–1.03)

Had children of both sexes

 Yes

1.06 (0.76–1.47)

1.06 (0.76–1.47)

1.05 (0.76–1.46)

0.91 (0.71–1.16)

0.93 (0.72–1.20)

0.93 (0.73–1.20)

 No (Ref.)

1

1

1

1

1

1

Previous number of live births

1.01 (0.90–1.12)

0.95 (0.86–1.05)

0.94 (0.85–1.04)

0.97 (0.88–1.06)

1.01 (0.92–1.12)

1.01 (0.92–1.12)

Previous number of child deaths

1.18* (0.98–1.43)

1.20* (1.00–1.44)

1.19* (0.99–1.42)

0.83* (0.68–1.02)

0.83* (0.67–1.02)

0.82* (0.67–1.02)

Observations

2852

2852

2852

2852

2852

2852

  1. Note. 95% confidence interval for SHR in parentheses; Ref. = Reference category; *** p < 0.01, ** p < 0.05, * p < 0.1