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Table 5 Crude and adjusted hazard ratios of time to second birth interval among women in selected four SSA countries

From: A comparative analysis of the influence of contraceptive use and fertility desire on the duration of second birth interval in four sub-Saharan African countries

Characteristics Crude model Model 1 Model 2
HR (95% CI) aHR (95% CI) aHR (95% CI)
Fertility desired
No more (R) 1 1 1
Wanted 0.96 (0.94,0.98)*** 0.93 (0.92,0.95)*** 0.86 (0.85,0.88)***
Undecided 1.04 (1.00,1.08) 1.00 (0.96,1.04) 0.92 (0.89,0.96)***
Contraceptive use
Never 1.34 (1.31,1.37)*** 1.35 (1.32,1.38)*** 0.93 (0.90,0.95)***
Formal 1.07 (1.04,1.10)*** 1.07 (1.04,1.10)*** 0.93 (0.90,0.95)***
Current (R) 1 1 1
Country
Nigeria 2.50 (2.42,2.59)***   1.85 (1.78,1.93)***
Ethiopia 1.47 (1.42,1.53)***   0.99 (0.95,1.04)
DR Congo 2.64 (2.54,2.73)***   2.01 (1.93,2.10)***
South Africa (R) 1   1
Residence
Urban (R) 1   1
Rural 1.35 (1.32,1.37)***   1.10 (1.07,1.13)***
Age at birth
 < 20 (R) 1   1
20–24 0.89 (0.87,0.90)***   0.98 (0.96,1.00)*
 ≥ 25 0.77 (0.75,0.79)***   0.87 (0.84,0.90)***
Wealth index
Low (R) 1   1
Middle 0.92 (0.90,0.94)***   0.96 (0.94,0.99)**
High 0.70 (0.69,0.72)***   0.86 (0.83,0.88)***
Education
No education (R) 1   1
Primary 0.81 (0.79,0.82)***   0.84 (0.82,0.86)***
Secondary 0.65 (0.64,0.67)***   0.81 (0.79,0.83)***
Higher 0.56 (0.54,0.59)***   0.75 (0.72,0.79)***
Employment status
Not working (R) 1   1
Working 1.12 (1.10,1.14)***   0.91 (0.90,0.93)***
Marital at FB
Never married (R) 1   1
Married before FB 2.87 (2.74,3.00)***   2.13 (2.03,2.24)***
Married after FB 2.25 (2.14,2.36)***   1.84 (1.75,1.93)***
FB sex
Male 1   1
Female (R) 1.02 (1.00,1.04)   1.01 (0.99,1.03)
FB survival
Dead 1.15 (1.10,1.19)***   1.06 (1.02,1.09)**
Alive (R) 1   1
Deviance (-2ll)   971,933.6*** 964,037.4***
  1. ***p < .001; **p < .01, *p < .05; (a)HR—(adjusted) hazard ratio; CI—confidence interval; R—reference category; ll—loglikelihood; FB—first birth