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Table 3 Multiple cox proportional hazard models of relationship between timing of first childbirth and background characteristics

From: Survival analysis and prognostic factors of timing of first childbirth among women in Nigeria

 

Model I

Model II

Model III

Model IV

Characteristics

aHR(95 % CI)

aHR(95 % CI)

aHR(95 % CI)

aHR(95 % CI)

Residence

    

 North Central

 

*0.89(0.84–0.94)

0.96(0.91–1.02)

0.99(0.94–1.05)

 North East

 

*1.14(1.07–1.21)

*1.16(1.09–1.23)

*1.20(1.13–1.28)

 North West

 

*1.21(1.13–1.29)

*1.22(1.14–1.31)

*1.26(1.18–1.35)

 South East

 

1.00(0.91–1.09)

0.95(0.87–1.03)

0.98(0.90–1.07)

 South South

 

*0.94(0.88–1.00)

1.03(0.97–1.09)

1.02(0.96–1.08)

 South Westa

    

Residence

    

 Urbana

    

 Rural

 

*1.42(1.38–1.46)

*1.14(1.11–1.17)

*1.15(1.12–1.19)

Education

    

 No education

*3.97(3.77–4.17)

 

*3.17(3.00–3.36)

*3.36(3.17–3.55)

 Primary

*3.39(3.22–3.57)

 

*3.12(2.96–3.29)

*3.24(3.08–3.42)

 Secondary

*1.83(1.74–1.92)

 

*1.75(1.67–1.84)

*1.79(1.71–1.88)

 Highera

    

Age at 1st Marriage

   

 Nevera

  

*0.16(0.14–0.19)

*0.19(0.18–0.20)

 Before 15

  

*5.92(5.57–6.01)

*6.31(5.92–6.56)

 15–19

  

*3.00(2.89–3.10)

*3.02(2.92–3.13)

 20+

    

Religion

    

 Catholicsa

    

 Other Christian

 

*1.07(1.02–1.12)

*1.07(1.02–1.12)

*1.08(1.03–1.13)

 Islam

 

*1.43(1.35–1.51)

*1.12(1.06–1.19)

*1.16(1.10–1.23)

 Others

 

*1.54(1.39–1.71)

*1.16(1.05–1.29)

*1.21(1.09–1.35)

Ethnicity

    

 Yorubaa

    

 Igbo/Ibiobio

 

*0.86(0.80–0.94)

*0.83(0.77–0.91)

*0.85(0.78–0.93)

 Hausa/Fulani

 

*1.37(1.28–1.46)

*1.11(1.04–1.18)

*1.16(1.09–1.24)

 Others

 

*1.18(1.11–1.24)

0.99(0.93–1.04)

1.02(0.96–1.08)

Ever Had pregnancy terminated

   

 Noa

    

 Yes

   

*1.09(1.05–1.13)

Ever used contraceptives

   

 No

   

*0.79(0.76–0.81)

 Yesa

    

Region

    

 Southa

    

 North

*1.24(1.20–1.27)

   

−2Log L

526,294.41

528,314.50

525,688.86

525,434.08

Chi Square

7029.51

5009.11

7634.74

7889.53

  1. aHR adjusted Hazard ratio CI Confidence Interval a Reference *Significant at p < 0.05