Table 3. Number of transferred embryos with known implantation data (KID), area under the curve (AUC) and 95% confidence intervals (C.I.) for the following sub-groups: age, insemination method, length of incubation and fresh vs cryopreserved embryo transfer.

Parameters	Sub-group	Number of KID embryos	AUC	95% C.I.
Overall		2212	0.67	0.64–0.69
Age	<30	177	0.69	0.61–0.77
	30–34	444	0.63	0.58–0.68
	35–39	655	0.67	0.63–0.72
	>39	598	0.66	0.61–0.72
Insemination method	ICSI	738	0.69	0.65–0.73
	IVF	343	0.67	0.62–0.73
Length of incubation	D5	1894	0.65	0.63–0.68
	D6	303	0.66	0.57–0.74
Transfer protocol	Fresh	1070	0.69	0.66–0.72
	Cryopreserved	1142	0.65*	0.61–0.68

A significantly lower AUC for a sub-group compared to the AUC for the remaining sub-groups is indicated with a star (p < 0.05). In addition, a precision-recall (PR) curve was calculated for the KID embryos (S2 Fig).