Table 7 Multivariable analysis of inverse Weibull gamma shared frailty model for time to first birth and among reproductive-age women in high fertility countries in SSA (n = 186,771)

Residence

 Urban

46387

24191

1

1

 Rural

91025

25168

1.22 (1.21, 1.24)

1.02 (1.00, 1.04)

Occupation of the respondent

 No working

32316

20923

1

1

 agricultural employee

40676

7904

0.91 (0.89, 0.91)

1.14 (1.13, 1.17)

 Nonagricultural employee

64419

20533

0.91 (0.89, 0.92)

1.06 (1.05, 1.08)

Age at first sex

 < 15

18696

32135

3.07 (3.01, 3.13)

1.57 (1.54, 1.61)

 15–17

87416

10738

2.19 (2.16, 2.22)

1.41 (1.38, 1.43)

 ≥ 18

31243

6433

1

1

Age at first marriage

 < 15

25203

1150

6.24 (6.14, 6.33)

5.47 (5.37, 5.57)

 15–17

46879

3471

3.67 (3.63, 3.72)

3.27 (3.22, 3.32)

 ≥ 18

59,407

4878

1

1

Demand for contraceptive

 No demand

27519

36483

1

1

 Unmet need for contraceptive

32840

2879

1.20 (1.18, 1.22)

1.39 (1.37, 1.42)

 Met need for contraceptive

77053

9998

1.15 (1.14, 1.17)

1.32 (1.30, 1.35)

Spousal age gap

 < 5

30425

1994

1

1

 ≥ 5

88908

6661

1.40 (1.38, 1.42)

1.17 (1.15, 1.19)

Hearing family planning massage on media

 Yes

98545

33788

1

1

 No

38866

15571

0.92 (0.91, 0.94)

1.02 (1.01, 1.04)

 Theta

0.19 (0.18, 0.21)

0.084 (0.075, 0.093)

 MHR

1.52(1.503, 1.55)

1.32(1.30, 1.34)

 LR test of theta = 0

< 0.001

< 0.001

 Prob-hibar2

7602.79

3610.87