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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