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Table 2 Summary of Kaplan-Meier survival tests & Adjusted hazard ratios for age at first birth

From: A survival analysis of the timing of onset of childbearing among young females in Nigeria: are predictors the same across regions?

  Event Summary of Kaplan-Meier tests Adjusted Hazard ratios
Began childbearing (%) Estimated mean age (in years) at first birth (95% CI) HR (95% CI)
Location
 Urban (RC) 1395 (23.9) 21.83 (21.73–21.92)  
 Rural 3928 (44.7) 19.67 (19.58–19.75) 1.06 (0.98–1.14)
 Log Rank (Mantel-Cox) Chi-square   991.03 (p < 0.001)  
Education
 No education (RC) 2539 (63.1) 18.03 (17.93–18.14)  
 Primary 907 (48.8) 19.16 (18.98–19.34) 0.96 (0.88–1.05)
 Secondary 1772 (22.4) 21.71 (21.63–21.79) 0.70 (0.64–0.77)***
 Higher 105 (12.7) 23.38 (23.26–23.50) 0.36 (0.29–0.45)***
 Log Rank (Mantel-Cox) Chi-square   3703.39 (p < 0.001)  
Religion
 Catholics (RC) 367 (22.9) 21.94 (21.77–22.12)  
 Other Christians 1503 (25.6) 21.63 (21.53–21.72) 1.06 (0.94–1.19)
 Muslims 3383 (48.4) 19.30 (19.20–19.39) 0.98 (0.86–1.13)
 Log Rank (Mantel-Cox) Chi-square   1371.861 (p < 0.001)  
Wealth quintile
 Poorest (RC) 1260 (57.5) 18.16 (18.00–18.32)  
 Poorer 1429 (49.3) 19.17 (19.02–19.32) 0.89 (0.83–0.96)**
 Middle 1169 (36.0) 20.50 (20.36–20.64) 0.86 (0.79–0.94)**
 Richer 964 (28.7) 21.38 (21.26–21.51) 0.72 (0.65–0.81)***
 Richest 501 (17.1) 22.53 (22.42–22.64) 0.56 (0.49–0.64)***
 Log Rank (Mantel-Cox) Chi-square   2199 (p < 0.001)  
Ever/never married
 Single never married 450 (5.5) 23.35 (23.29–23.41)  
 Ever married/cohabited 4873 (75.8) 18.33 (18.25–18.40) 10.60 (9.56–11.75)***
 Log Rank (Mantel-Cox) Chi-square   5813.19 (p < 0.001)  
Region
 North Central 768 (31.6) 21.11 (20.96–21.27)  
 North East 1243 (49.1) 19.26 (19.10–19.42) 1.24 (1.12–1.37)***
 North West 1865 (52.1) 18.81 (18.68–18.95) 1.21 (1.10–1.33)***
 South East 325 (19.7) 22.29 (22.14–22.45) 1.02 (0.88–1.17)
 South South 675 (27.7) 21.36 (21.21–21.52) 1.45 (1.29–1.62)***
 South West 447 (22.5) 21.96 (21.80–22.11) 1.14 (1.01–1.29)*
 Log Rank (Mantel-Cox) Chi-square   1777.26 (p < 0.001)  
  1. * p < 0.05, ** p < 0.01, *** p < 0.001
  2. HR Hazard ratio, RC Reference Category, CI Confidence Interval