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Table 3 Kaplan–Meier failure estimate and log rank test comparison of time to first birth among reproductive age women in Ethiopia, 2016 EDHS

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

Characteristics N (%) Ever given birth Median (IQR) years Log-rank p value
Region
 Northern 4827 (30.87) 3224 (66.8) 19 [16–24] 570.2 < 0.001
 Oromia 5682 (36.34) 4130 (72.7) 19 [16–22]   
 SNNPR 3282 (21.00) 2192 (66.8) 20 [16–24]   
 Most-urban 1042 (6.74) 474 (45.5) 26 [19–34]   
 Eastern-pasto 585 (3.74) 424 (72.4) 19 [16–22]   
 Western-semi Pasto 204 (1.30) 144 (70.7) 19 [16–22]   
Residence
 Urban 3447 (22.12) 1769 (51.3) 23 [18–30] 916.7 < 0.001
 Rural 12,175 (77.88) 8818 (72.4) 19 [16–22]   
Education
 No education 7469 (47.77) 6785 (90.9) 18 [15–21] 2545.8 < 0.001
 Primary 5475 (35.04) 2865 (52.3) 20 [17–24]   
 Secondary 1802 (11.61) 593 (32.8) 26 [20–37]   
 Higher 868 (5.57) 344 (39.6) 27 [21–49]   
Occupation
 Not working 7799 (49.91) 5243 (67.2) 19 [16–23] 461.0 < 0.001
 Agriculture 3248 (20.77) 2522 (77.6) 19 [15–21]   
 Non agricul- 4576 (29.32) 2822 (61.8) 21 [17–27]   
Wealth index
 Poorest 2630 (16.82) 2060 (78.3) 19 [16–22] 903.9 < 0.001
 Poorer 2803 (17.93) 2122 (75.7) 19 [16–21]   
 Middle 2968 (18.98) 2128 (71.7) 19 [16–22]   
 Richer 3090 (19.76) 2089 (67.6) 19 [16–23]   
 Richest 4131 (26.49) 2190 (53.0) 22 [17–30]   
Contraceptive
 Ever not use 8895 (56.95) 4617 (51.9) 21 [17–26] 844.2 < 0001
 Ever use 6727 (43.05) 5970 (88.7) 19 [16–22]   
Media exposure
 No 11,508 (73.63) 8342 (72.5) 19 [16–22] 576.6 < 0.001
 Yes 4115 (26.37) 2245 (54.6) 22 [17–28]   
Ever married
 No 4022 (25.81) 93 (2.3) 3974.7 < 0.001
 Yes 11,600 (74.19) 10,494 (90.5) 19 [15–21]   
Spousal age gap
 < 5 years 3326 (32.63) 2984 (89.7) 19 [16–22] 129.2  < 0.001
 ≥ 5 years 6,867 (67.37) 6366 (92.7) 18 [15–21]   
Age at first marriage
 Below age 15 3044 (26.24) 2915 (95.8) 16 [14–17] 5582.3 < 0.001
 15–17 4256 (36.69) 3890 (91.4) 18 [16–19]   
 18 and above 4300 (37.07) 3689 (85.8) 22 [19–25]   
Age at first sex
 < 15 years 3027 (19.36) 2860 (94.47) 15 [13–18]   
 15–17 years 5062 (32.38) 4576 (90.4) 18 [16–20]   
 ≥ 18 years 7546 (48.26) 3151 (41.75) 22 [19–26]   
Husband-education
 No education 4750 (46.60) 4516 (95.1) 18 [15–21] 396.1  < 0.001
 Primary 3765 (36.94) 3454 (91.7) 18 [15–21]   
 Secondary 971 (9.53) 808 (83.2) 20 [16–23]   
 Higher 707 (6.94) 573 (81.1) 21 [17–25]   
Husband occupation
 Not working 802 (7.87) 740 (92.3) 18 256.1 0.001
 Agriculture employee 6323 (61.93) 5930 (93.9) 18   
 Nonagriculture 3078 (30.20) 2681 (87.1) 19   
Religion
 Orthodox 6762 (43.25) 4371 (64.6) 20 178.6 < 0.001
 Muslim 4881 (31.22) 3593 (73.6) 19   
 Protestant 3662 (23.42) 2367 (64.7) 20   
 Others 330 (2.11) 255 (77.1) 19   
Total 15,635 10,635 (67.7) 20 [16, 24]   
  1. N weighted value, IQR interquartile range