Table 2. Influence of the C398G polymorphism of the GDF-9 gene in patients undergoing IVF
Parameter Genotype* pϯ Post Hoc Allele* p§
  CC (44) CG (18) GG
(3)		   pŧ C (106) G
(24)		  
Menstrual cycle length (days) 29.2 28.6 26.3 0.406 - 29.1 28.0 0.888
Body mass index (kg/m2) 24.5 23.5 23.4 0.593 - 24.3 23.5 0.302
Antral follicle count (N) 11.5 9.06 9.00 0.214 - 11.1 9.04 0.084
Days of induction (N) 9.4 9.7 8.6 0.589 - 9.53 9.50 0.944
r-FSH (IU) 1559 1365 1450 0.142 - 1526 1386 0.079
Endometrial thickness (mm) 9.7 9.5 9.8 0.929 - 9.75 9.65 0.826
Follicles >17 mm on trigger day (N) 6.95 4.22 4.67 0.021 ǁ0.022
0.844		 6.49 4.33 0.001
Fowllicles 14-16 mm on trigger day (N) 3.11 2.11 3.33 0.254 - 2.94 2.42 0.293
Follicles 12-14 mm on trigger day (N) 2.41 1.44 1.33 0.120 - 2.25 1.42 0.017
Total follicles (N) 10.77 6.89 8.67 0.049

ǁ0.049
0.873

 10.11 7.33 0.032
Total oocytes (N) 11.68 7.33 9.00 0.134 - 10.94 7.75 0.048
MII oocytes (N) 9.55 5.39 5.33 0.048 ǁ0.049
0.796		 8.84 5.38 0.017
MI oocytes (N) 0.60 0.79 0.76 0.151 - 0.69 0.96 0.400
VG oocytes (N) 1.10 1.24 0.88 0.964 - 1.12 1.13 0.995
FSH, 3rd day of menstrual cycle 6.83 5.02 5.55 0.165 - 5.47 5.99 0.633
E2, 3rd day of menstrual cycle 61.35 49.89 56.63 0.729 - 59.21 51.73 0.506
LH, 3rd day of menstrual cycle 4.79 4.04 2.76 0.440 - 4.65 3.67 0.180
AMH 1.51 2.15 0.56 0.404 - 1.63 1.75 0.802
LH, on trigger day 1.47 2.27 0.90 0.351 - 1.93 1.59 0.495
Progesterone (ng/ml), on trigger day 1.04 0.54 0.23 0.347 - 0.96 0.47 0.003
E2, on trigger day 1024 1043 672 0.629 - 1108 1194 0.678
* C: cytosine; G: guanine
ϯ Analysis of variance (ANOVA)
ŧ Bonferroni test
§ t-test
ǁ Difference between CC and CG
Difference between CC and GG