Table 2.

χ² Test results comparing embryos with any C rating to those without a C rating.

	Embryos with a C rating			Embryos with no C rating			P
	n	% of Total	% of Previous successes	n	% of Total	% of Previous successes	Of Total	Of previous successes
Positive β-hCG rates	94	42.3	42.3	729	59.2	59.2	<.001	n/a
Implantation rates	69	31.1	73.4 (69/94)	582	47.2	79.8 (582/729)	<.001	0.188
Clinical pregnancy rates	54	24.3	78.3 (54/69)	526	42.7	90.4 (526/582)	<.001	0.003
Ongoing pregnancy rates	46	20.7	85.2 (46/54)	459	37.2	87.3 (459/526)	<.001	0.665
Live birth rates	45	20.3	97.8 (45/46)	456	37.0	99.3 (456/459)	<.001	0.041

Note: n/a = not applicable.