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. 2019 Oct 31;137(4):379–383. doi: 10.1590/1516-3180.2018.05111220719

Table 1. Baseline, laboratory and clinical parameters of all seasonal groups.

Season

  • Spring group

  • (n = 154)

  • Winter group

  • (n = 105)

  • Autumn group

  • (n = 113)

  • Summer group

  • ( n = 94)

 P
Age (years) 27.18 ± 4.54 26.41 ± 4.88 26.97 ± 4.89 27.23 ± 5.17 0.575*
Basal FSH (IU/ml) 6.64 ± 1.86 6.69 ± 2.23 6.65 ± 2.01 6.33 ± 1.79 0.541*
Basal E2 (pg/ml) 41.78 ± 12.99 39.79 ± 15.47 39.91 ± 20.58 43.31 ± 18.55 0.747*
Duration of infertility (years) 4.02 ± 2.74 3.51 ± 2.19 3.49 ±1.80 3.32 ± 1.94 0.078*
Antral follicle count 9.41 ± 2.51 10.32 ± 5.18 9.53 ± 2.36 9.85 ± 2.20 0.301*
Duration of stimulation (days) 12.23 ± 1.55 12.10 ± 1.34 12.18 ± 1.33 12.03 ± 1.37 0.707*
Stimulation protocol CC (%) 105 (68.2) 77 (73.3) 84 (74.3) 71 (75.5) 0.559**
Gonadotropin (%) 49 (31.8) 28 (26.7) 29 (25.7) 23 (24.5)
Peak E2 (pg/ml) 699.37 ± 556.73 740.88 ± 564.30 924.29 ± 712.02 629.09 ± 432.74 0.274*
Endometrial thickness on HCG day (mm) 8.46 ± 1.06 8.88 ± 1.74 8.44 ± 2.09 8.78 ± 1.99 0.084*
Clinical pregnancy rate (%) 24 (15.6) 9 (8.6) 13 (11.5) 7 (7.4) 0.174***

FSH = follicle stimulating hormone; E2 = estradiol; CC = clomiphene citrate; HCG = human chorionic gonadotropin.

P-values of less than 0.05 were considered statistically significant.

*Analysis of variance (ANOVA); **Chi-square test; ***Fisher’s exact test.