Table 4: Efron estimation.

CPHM							BCPHM					JCPHM
Covariate (Reference)	Level	HR	SE	z	P>z	95% CI	HR	SE	z	P>z	95% CI	HR	SE	z	P>z	95% CI
Age (Under 20 years old)	20 to 34 years old	0.160	0.079	-3.680	p < 0.001	[0.060; 0.424]	0.160	0.323	-0.910	0.364	[0.003; 8.374]	0.160	0.087	-3.370	0.001	[0.055; 0.464]
	35 years old and above	0.199	0.107	-2.990	0.003	[0.069; 0.573]	0.199	0.406	-0.790	0.429	[0.004; 10.896]	0.199	0.120	-2.680	0.007	[0.061; 0.648]
Residence (Rural)	Urban	1.029	0.246	0.120	0.907	[0.643; 1.645]	1.029	0.307	0.090	0.925	[0.573; 1.847]	1.029	0.314	0.090	0.927	[0.565; 1.871]
Antecedents (Not 1st newborn)	1st newborn	0.723	0.212	-1.110	0.268	[0.407; 1.283]	0.723	0.227	-1.030	0.301	[0.391; 1.337]	0.723	0.233	-1.010	0.314	[0.384; 1.359]
Abortion (Not aborted)	Aborted once	1.588	0.628	1.170	0.242	[0.732; 3.448]	1.588	0.696	1.060	0.291	[0.673; 3.749]	1.588	0.659	1.110	0.265	[0.704; 3.585]
	Aborted more than once	1.147	0.519	0.300	0.762	[0.473; 2.782]	1.147	4.651	0.030	0.973	[0.000; 3.251x 103]	1.147	0.587	0.270	0.789	[0.420; 3.127]
Childbirth (Ventouse)	Natural	0.532	0.400	-0.840	0.401	[0.122; 2.319]	0.532	3.646	-0.090	0.927	[0.000; 3.605x 105]	0.532	0.448	-0.750	0.454	[0.102; 2.772]
	Surgery	0.695	0.515	-0.490	0.624	[0.163; 2.969]	0.695	4.766	-0.050	0.958	[0.000; 4.743x 105]	0.695	0.579	-0.440	0.663	[0.136; 3.558]
Gender (Female)	Male	2.061	0.500	2.980	0.003	[1.282; 3.315]	2.061	0.556	2.680	0.007	[1.215; 3.496]	2.061	0.592	2.520	0.012	[1.173; 3.621]
Number (Singleton)	Multiple	0.243	0.113	-3.040	0.002	[0.098; 0.606]	0.243	0.135	-2.540	0.011	[0.082; 0.724]	0.243	0.141	-2.440	0.015	[0.078; 0.759]
APGAR (Below 4/10)	4/10 to 6/10	0.207	0.084	-3.880	p < 0.001	[0.094; 0.460]	0.207	0.116	-2.820	0.005	[0.070; 0.618]	0.207	0.120	-2.710	0.007	[0.066; 0.648]
	7/10 and above	0.030	0.012	-8.960	p < 0.001	[0.014; 0.065]	0.030	0.015	-7.070	p < 0.001	[0.011; 0.080]	0.030	0.016	-6.750	p < 0.001	[0.011; 0.083]
Weight (Under 2500 g)	2500 g to 4500 g	0.222	0.088	-3.800	p < 0.001	[0.102; 0.483]	0.222	0.105	-3.180	0.001	[0.088; 0.562]	0.222	0.107	-3.110	0.002	[0.086; 0.574]
	Above 4500 g	0.389	0.426	-0.860	0.389	[0.045; 3.338]	0.389	8.081	-0.050	0.964	[0.000; 1.950x 1017]	0.389	17.369	-0.020	0.983	[0.000; 4.530x 1037]
Head (Below 32 cm)	32 cm to 36 cm	0.284	0.110	-3.250	0.001	[0.133; 0.607]	0.284	0.115	-3.100	0.002	[0.129; 0.629]	0.284	0.119	-3.000	0.003	[0.125; 0.647]
	Above 36 cm	0.110	0.117	-2.070	0.038	[0.014; 0.886]	0.110	2.350	-0.100	0.918	[0.000; 1.590x 1017]	0.110	3.679	-0.070	0.947	[0.000; 3.080x 1027]
Height (Below 36 cm)	46 cm to 54 cm	0.569	0.238	-1.350	0.177	[0.251; 1.291]	0.569	0.252	-1.270	0.202	[0.239; 1.354]	0.569	0.273	-1.180	0.240	[0.222; 1.457]
	Above 54 cm	1.010	1.094	0.010	0.993	[0.121; 8.431]	1.010	21.269	0.000	1.000	[0.000; 18.460x 1017]	1.010	44.776	0.000	1.000	[0.000; 5.730x 1037]
Adjusted CPHM							Adjusted BCPHM					Adjusted JCPHM
Age (Under 20 years old)	20 to 34 years old	0.201	0.098	-3.280	0.001	[0.077; 0.524]	-	-	-	-	-	0.201	0.102	-3.170	0.002	[0.075; 0.543]
	35 years old and above	0.293	0.152	-2.360	0.018	[0.106; 0.811]	-	-	-	-	-	0.293	0.160	-2.250	0.025	[0.101; 0.856]
Gender (Female)	Male	2.071	0.495	3.050	0.002	[1.297; 3.308]	1.562	0.400	1.740	0.081	[0.946; 2.579]	2.071	0.587	2.570	0.010	[1.188; 3.611]
Number (Singleton)	Multiple	0.205	0.092	-3.520	p < 0.001	[0.085; 0.495]	-	-	-	-	-	0.205	0.118	-2.740	0.006	[0.066; 0.637]
APGAR (Below 4/10)	4/10 to 6/10	0.273	0.103	-3.430	0.001	[0.130; 0.573]	0.545	0.273	-1.210	0.226	[0.204; 1.457]	0.273	0.169	-2.100	0.036	[0.081; 0.919]
	7/10 and above	0.038	0.014	-8.980	p < 0.001	[0.019; 0.078]	0.077	0.036	-5.440	p < 0.001	[0.030; 0.193]	0.038	0.023	-5.530	p < 0.001	[0.012; 0.122]
Weight (Under 2500 g)	2500 g to 4500 g	0.179	0.063	-4.890	p < 0.001	[0.090; 0.356]	0.201	0.083	-3.880	0.000	[0.089; 0.452]	0.179	0.071	-4.360	p < 0.001	[0.082; 0.388]
	Above 4500 g	0.379	0.396	-0.930	0.353	[0.049; 2.938]	0.477	9.872	-0.040	0.971	[0.000; 2.040x 1017]	0.379	16.849	-0.020	0.983	[0.000; 2.970x 1037]
Head (Below 32 cm)	32 cm to 36 cm	0.205	0.067	-4.860	p < 0.001	[0.108; 0.388]	0.215	0.090	-3.680	p < 0.001	[0.095; 0.487]	0.205	0.081	-4.030	p < 0.001	[0.095; 0.443]
	Above 36 cm	0.095	0.100	-2.250	0.025	[0.012; 0.740]	0.105	2.180	-0.110	0.914	[0.000; 5.960x 1016]	0.095	4.226	-0.050	0.958	[0.000; 5.340x 1036]
		X2= 316.160, p < 0.001					X2= 297.200, p < 0.001					X2= 29.760, p < 0.001