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

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