Table 1.

Characteristics of the population

Characteristics	Control n = 29	Recurrent pregnancy loss n = 21	P value
Age (y) mean (SD)	29.8 (4.1)	33.9 (4.7)	0.001a
N. of miscarriage mean (SEM)		3.5 (0.3)
Endometrial dating
in/out-of-phase (n)	26/3	10/11	0.001b
Defect type c n (%)
In phase with β3 +	24 (82.8)	6 (28.6)	0.0005b
Type I	3 (10.3)	11 (52.4)
Type II	2 (6.9)	4 (19.1)

^aUnpaired Student t test.

^bChi-square for trend.

^cIn phase endometrium has positive β3 integrin subunit.

Type I defect is an out-of-phase endometrium and β3 integrin subunit expression is negative.

Type II defect is an “in-phase” endometrium and β3 integrin subunit expression is negative.