Table 3: Breslow 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	0.172	0.086	-3.540	p < 0.001	[0.065; 0.456]	0.172	0.254	-1.190	0.234	[0.009; 3.124]	0.172	0.089	-3.400	0.001	[0.062; 0.475]
	35 years old and above	0.216	0.117	-2.840	0.005	[0.075; 0.623]	0.216	0.323	-1.020	0.306	[0.012; 4.058]	0.216	0.124	-2.660	0.008	[0.070; 0.667]
Residence (Rural)	Urban	1.014	0.240	0.060	0.954	[0.637; 1.614]	1.014	0.277	0.050	0.960	[0.594; 1.732]	1.014	0.285	0.050	0.961	[0.585; 1.758]
Antecedents (Not 1st newborn)	1st newborn	0.778	0.221	-0.880	0.377	[0.446; 1.358]	0.778	0.223	-0.880	0.381	[0.444; 1.364]	0.778	0.218	-0.900	0.370	[0.449; 1.347]
Abortion (Not aborted)	Aborted once	1.646	0.648	1.270	0.206	[0.761; 3.562]	1.646	0.695	1.180	0.238	[0.720; 3.763]	1.646	0.664	1.230	0.217	[0.746; 3.633]
	Aborted more than once	1.111	0.503	0.230	0.817	[0.457; 2.700]	1.111	2.084	0.060	0.955	[0.028; 43.927]	1.111	0.556	0.210	0.834	[0.416; 2.966]
Childbirth (Ventouse)	Natural	0.593	0.449	-0.690	0.490	[0.135; 2.612]	0.593	3.846	-0.080	0.936	[0.000; 1.963x 105]	0.593	0.469	-0.660	0.509	[0.126; 2.797]
	Surgery	0.777	0.580	-0.340	0.736	[0.180; 3.358]	0.777	5.021	-0.040	0.969	[0.000; 2.443x 105]	0.777	0.611	-0.320	0.749	[0.166; 3.630]
Gender (Female)	Male	1.964	0.472	2.810	0.005	[1.227; 3.146]	1.964	0.480	2.760	0.006	[1.217; 3.170]	1.964	0.504	2.630	0.009	[1.188; 3.248]
Number (Singleton)	Multiple	0.306	0.136	-2.660	0.008	[0.128; 0.732]	0.306	0.730	-0.500	0.620	[0.003; 32.826]	0.306	0.136	-2.670	0.008	[0.128; 0.729]
APGAR (Below 4/10)	4/10 to 6/10	0.335	0.133	-2.760	0.006	[0.154; 0.729]	0.335	0.160	-2.290	0.022	[0.131; 0.856]	0.335	0.157	-2.340	0.020	[0.134; 0.839]
	7/10 and above	0.049	0.019	-7.860	p < 0.001	[0.023; 0.103]	0.049	0.020	-7.300	p < 0.001	[0.022; 0.110]	0.049	0.020	-7.380	p < 0.001	[0.022; 0.109]
Weight (Under 2500 g)	2500 g to 4500 g	0.227	0.089	-3.790	p < 0.001	[0.105; 0.489]	0.227	0.102	-3.300	0.001	[0.094; 0.548]	0.227	0.105	-3.210	0.001	[0.091; 0.561]
	Above 4500 g	0.392	0.421	-0.870	0.383	[0.048; 3.213]	0.392	8.103	-0.050	0.964	[0.000; 1.600x 1017]	0.392	17.310	-0.020	0.983	[0.000; 1.740x 1037]
Head (Below 32 cm)	32 cm to 36 cm	0.288	0.111	-3.230	0.001	[0.136; 0.613]	0.288	0.121	-2.960	0.003	[0.127; 0.658]	0.288	0.116	-3.090	0.002	[0.131; 0.635]
	Above 36 cm	0.122	0.128	-2.010	0.045	[0.016; 0.951]	0.122	2.449	-0.100	0.917	[0.000; 1.670x 1016]	0.122	5.426	-0.050	0.962	[0.000; 1.220x 1037]
Height (Below 36 cm)	46 cm to 54 cm	0.567	0.235	-1.370	0.171	[0.251; 1.278]	0.567	0.240	-1.340	0.180	[0.247; 1.300]	0.567	0.247	-1.300	0.193	[0.241; 1.334]
	Above 54 cm	1.020	1.100	0.020	0.986	[0.123; 8.444]	1.020	21.073	0.000	0.999	[0.000; 3.980x 1017]	1.020	44.687	0.000	1.000	[0.000; 2.150x 1037]
Adjusted CPHM							Adjusted BCPHM					Adjusted JCPHM
Age (Under 20 years old)	20 to 34 years old	0.215	0.105	-3.150	0.002	[0.083; 0.559]	-	-	-	-	-	0.215	0.104	-3.190	0.001	[0.084; 0.554]
	35 years old and above	0.308	0.159	-2.280	0.023	[0.112; 0.848]	-	-	-	-	-	0.308	0.160	-2.270	0.023	[0.111; 0.852]
Gender (Female)	Male	1.942	0.459	2.810	0.005	[1.222; 3.085]	1.562	0.350	1.990	0.046	[1.007; 2.424]	1.942	0.476	2.700	0.007	[1.200; 3.142]
Number (Singleton)	Multiple	0.264	0.115	-3.060	0.002	[0.112; 0.619]	-	-	-	-	-	0.264	0.117	-3.010	0.003	[0.111; 0.629]
APGAR (Below 4/10)	4/10 to 6/10	0.411	0.154	-2.380	0.017	[0.198; 0.856]	0.695	0.288	-0.880	0.379	[0.308; 1.565]	0.411	0.185	-1.970	0.049	[0.170; 0.995]
	7/10 and above	0.059	0.021	-7.850	p < 0.001	[0.029; 0.119]	0.100	0.039	-5.880	p < 0.001	[0.046; 0.215]	0.059	0.024	-6.810	p < 0.001	[0.026; 0.133]
Weight (Under 2500 g)	2500 g to 4500 g	0.181	0.064	-4.860	p < 0.001	[0.091; 0.361]	0.200	0.084	-3.840	p < 0.001	[0.088; 0.455]	0.181	0.071	-4.390	p < 0.001	[0.084; 0.389]
	Above 4500 g	0.372	0.384	-0.960	0.338	[0.049; 2.809]	0.438	8.985	-0.040	0.968	[0.000; 1.280x 1017]	0.372	16.296	-0.020	0.982	[0.000; 6.880x 1036]
Head (Below 32 cm)	32 cm to 36 cm	0.208	0.068	-4.830	p < 0.001	[0.110; 0.394]	0.216	0.088	-3.760	p < 0.001	[0.097; 0.480]	0.208	0.080	-4.060	p < 0.001	[0.098; 0.444]
	Above 36 cm	0.105	0.109	-2.180	0.029	[0.014; 0.797]	0.109	2.234	-0.110	0.914	[0.000; 2.600x 1016]	0.105	4.680	-0.050	0.960	[0.000; 9.160x 1036]
		X2= 300.360, p < 0.001					X2= 296.290, p < 0.001					X2= 32.310, p < 0.001