Survival analysis and prognostic factors of timing of first childbirth among women in Nigeria

Table 2 Median survival times and unadjusted hazard ratio of timing of first births among Nigerian women

Characteristics	MST (years)	Incidence rate	Hazard ratio	95 % CI of HR	p-value
Region
North Central	21	0.033	1.18	*1.13–1.23	0.000
North East	18	0.041	1.86	*1.79–1.94	0.000
North West	18	0.045	2.26	*2.17–2.35	0.000
South East	24	0.027	0.80	*0.77–0.85	0.000
South South	21	0.031	1.11	*1.06–1.16	0.000
South West^a	22	0.032
Residence
Urban^a	22	0.030
Rural	19	0.040	1.72	*1.68–1.76	0.000
Education
None	18	0.048	4.43	*4.22–4.64	0.000
Primary	19	0.044	3.43	*3.26–3.61	0.000
Secondary	22	0.026	1.81	*1.72–1.90	0.000
Higher^a	27	0.023
Age at 1^st Marriage
Never	na	0.003	0.18	*0.17–0.20	0.000
Before 15	15	0.059	6.12	*5.92–6.33	0.000
15–19	18	0.049	3.07	*2.98–3.17	0.000
20+	24	0.037
Religion
Catholics^a	23	0.028
Other Christians	22	0.031	1.17	*1.12–1.23	0.000
Islam	18	0.042	2.21	*2.12–2.31	0.000
Others	19	0.042	1.93	*1.75–2.14	0.000
Ethnicity
Yoruba^a	23	0.031
Igbo/Ibiobio	24	0.027	0.80	*0.76–0.83	0.000
Hausa/Fulani	18	0.045	2.33	*2.24–2.42	0.000
Others	20	0.035	1.34	*1.29–1.39	0.000
Smoking
No	20	0.036
Yes^a	19	0.040	1.05	0.88–1.26	0.553
Ever Had pregnancy terminated
No^a	20	0.035
Yes	20	0.043	1.08	*1.04–1.12	0.000
Ever Used Contraceptives
No	19	0.036	1.31	*1.27–1.34	0.000
Yes^a	22	0.036
Region
South^a	22	0.030
North	19	0.040	1.78	*1.74–1.82	0.000
Total	20	0.035

ISSN: 1471-2393