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Table 6 Bivariable and multivariable inverse-Weibull gamma shared frailty model on predictors of age at first birth among reproductive-age women in Ethiopia, EDHS, 2016

From: Time to first birth and its predictors among reproductive-age women in Ethiopia: inverse Weibull gamma shared frailty model

Variable Null model First birth status Full model
Log-likelihood − 1036.84    5907.45  
Effect size   Gave Not gave CHR AHR
Region
 Most urban   474 568 1 1
 Northern   3224 1603 1.08 (1.01–1.18)** 1.08 (0.97–1.19)
 Oromia   4130 1552 1.07 (0.98–1.18)* 1.18 (1.06–1.30)***
 SNNP   2192 1090 0.98 (0.90–1.18) 1.19 (1.06–1.33)***
 Eastern   424 161 1.00 (0.92–1.09) 1.16 (105–1.28)***
 Western   144 60 1.12 (1.03–1.22)** 1.37 (1.24–1.52)***
Residence
 Urban   1769 1678 1 1
 Rural   8818 3357 0.96 (0.91–1.02) 1.09 (0.98–1.19)
Education
 No education   6785 684 1 1
 Primary   2865 2610 1.72 (1.64–1.82)*** 1.12 (1.05–1.19)
 Secondary   593 1209 0.83 (0.76–0.87)*** 0.86 (0.78–0.96)***
 Higher   344 524 0.72 (0.65-.80)*** 0.75 (0.65–0.85)***
Occupation
 Not working   5243 2556 1.18 (1.13–1.24)*** 0.98 (0.92–1.04)
 Agriculture   2522 726 0.98 (0.93–1.04) 0.94 (0.88–1.02)
 Nonagriculture   2822 1754 1 1
Wealth index
 Poorest   2060 570 1 1
 Poorer   2122 681 1.03 (0.96–1.10) 0.98 (0.91–1.05)
 Middle   2128 840 1.12 (1.05–1.21)*** 1.00 (0.93–1.09)
 Richer   2089 1001 1.12 (1.05–1.21)*** 1.10 (1.01–1.19)*
 Richest   2190 1941 1.12 (1.05–1.21)*** 1.08 (0.97–1.15)
Spousal age diffe
 < 5 years   2984 342 1 1
 ≥ 5 years   6366 501 1.26 (1.21–1.33)*** 1.11 (1.05–1.16)***
Contraceptive
 Ever not use   4617 4278 1 1
 Ever use   5970 757 0.50 (0.48–0.52)*** 0.91 (0.86–0.97)***
Media exposure
 No   8342 3166 1 1
 Yes   2245 1870 1.10 (1.04–1.15)*** 1.01 (0.94–1.08)
Age at first marriage
 < 15 years   2915 129 9.10 (8.83–9.86)*** 1.26 (0.87–1.82)
 15–17 years   3890 366 3.47 (3.30–3.64)*** 2.33 (2.08–2.63)***
 ≥ 18 years   3689 611 1 1
Age at first sex
 < 15 years   2860 167 1.89 (1.78–1.99)*** 27.78 (23.26–32.26)***
 15—17 years   4576 486 0.68 (0.65–0.71)*** 2.60 (2.07–2.63)***
 ≥ 18 years   3151 4395 1 1
Husband education
 No Edu-   4516 234 1 1
 Primary   3454 311 0.99 (0.94–104) 1.03 (0.97–1.09)
 Secondary   808 163 0.88 (0.81–0.95)*** 1.05 (0.96–1.15)
 Higher   573 134 0.68 (0.63–0.74)*** 1.03 (0.93–1.14)
Husband occupation
 Not working   740 62 1.14 (1.05–1.23)*** 0.98 (0.91–1.o6)
 Agriculture   5930 393 1.13 (1.08–1.19)*** 0.96 (0.91–1.02)
 Non agriculture   2681 397 1 1
Religion
 Orthodox   4371 2391 1 1
 Muslim   3593 1288 1.02 (0.97–108) 1.10 (1.03–1.19)***
 protestant   2367 1295 0.99 (0.92–1.05) 1.01 (0.92–1.10)
 Others   255 75 0.90 (0.77–1.06) 1.03 (0.87–1.22)
> 18intercourse and marriage 1
< 15marriege < 15 intercourse 1.32 (0.62–2.89)
< 15 marriage 15-17intercourse 0.86 (0.62–1.23)
15–17 intercourse < 15marriage 4.55 (2.13–10.02)***
15–17 intercourse 15–17 marriage 2.63 (2.01–3.45)***
Theta 0.05 (0.04–0.06)     0.025 (0.016–0.039)***
MHR 1.24 (1.21–1.27)     1.16 (1.13–1.20)***
LR test of theta = 0
 Chibar2(1) 126.23     35.40
 Prob-hibar2  < 0.001      < 0.001
  1. *significant at 90 % Confidence level; **significant at 95% confidence level; ***significant at 99% confidence level
  2. MHR = median hazard ratio, † from interaction model