Table 8

Model fit statistics for each of the three cohorts overall and by subgroups based on birth weight, multiplicity and gestational age at birth

Birth cohort	Variable	Overall	Birth weight		Gestational age (weeks)			Multiplicity
Birth cohort	Variable	Overall	<50th centile	≥50th centile	22⁺⁰–26⁺⁶	27⁺⁰–29⁺⁶	30⁺⁰–31⁺⁶	Singleton	Multiple
Alive at onset of birth process	Number of babies	43 763	21 880	21 883	11 745	14 738	17 280	32 853	10 910
	Number surviving	38 133	18 834	19 299	7221	13 962	16 950	28 310	9823
	Predicted surviving	38 133	18 786	19 345	7178	14 050	16 905	28 310	9823
	C-statistic	0.89	0.89	0.88	0.83	0.63	0.62	0.88	0.92
	Hosmer-Lemeshow test	0.97	0.99	<0.001	0.76	<0.001	0.99	0.89	0.95
	Briers score	0.07	0.07	0.06	0.16	0.05	0.02	0.07	0.05
Provided active survival-focused care	Number of babies	42 004	20 847	21 157	10 105	14 653	17 246	31 412	10 592
	Number surviving	38 133	18 834	19 299	7221	13 962	16 950	28 310	9823
	Predicted surviving	38 133	18 794	19 339	7188	14 011	16 934	28 310	9823
	C-statistic	0.86	0.86	0.85	0.76	0.62	0.64	0.84	0.89
	Hosmer-Lemeshow test	0.91	0.99	0.29	0.89	<0.001	0.99	0.89	0.73
	Briers score	0.06	0.06	0.06	0.16	0.04	0.02	0.07	0.05
Neonatal admission	Number of babies	41 158	20 341	20 817	9432	14 553	17 173	30 665	10 493
	Number surviving	38 133	18 834	19 299	7221	13 962	16 950	28 310	9823
	Predicted surviving	38 133	18 784	19 349	7189	13 996	16 948	28 310	9823
	C-statistic	0.85	0.85	0.84	0.74	0.62	0.65	0.83	0.89
	Hosmer-Lemeshow test	0.15	0.80	0.01	0.98	<0.001	0.78	0.83	<0.001
	Briers score	0.05	0.05	0.05	0.15	0.04	0.01	0.06	0.04