Table 2.

Comparison of the case and control groups according to gender.

PAPP-A (ug/mL)	Male	Female	T/Z/x2 values	P
Case group	0.8641 ± 0.275	0.8112 ± 0.286	1.165	0.246
Control group	1.735 ± 0.331	1.651 ± 0.164	1.588	0.116
T/Z/x2 values	−3.300	−4.214
P	0.001	0.000