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Table 1 Baseline characteristics, follicle diameter, and hormone levels of records grouped by ovulation timing

From: Preovulatory progesterone levels are the top indicator for ovulation prediction based on machine learning model evaluation: a retrospective study

 

72 h

48 h

24 h

p.overall

p.72 h vs. 48 h

p.72 h vs. 24 h

p.48 h vs. 24 h

N = 306

N = 598

N = 728

Age (year)

33.2 ± 4.95

33.2 ± 4.88

33.2 ± 4.86

0.997

0.999

1.000

0.997

BMI (kg/m2)

21.8 ± 2.81

21.7 ± 2.72

21.7 ± 2.72

0.920

0.915

0.942

0.994

Diameter (mm)

16.3 ± 1.35

17.4 ± 1.54

18.4 ± 1.71

< 0.001

0.000

0.000

0.000

E2 (pg/ml)

282 ± 107

269 [201–336]

378 ± 128

368 [283–449]

286 ± 114

273 [203–351]

< 0.001

< 0.001

0.511

< 0.001

LH (mIU/ml)

14.5 ± 5.55

13.5 [10.6–17.2]

32.2 ± 16.4

28.6 [20.5–40.0]

50.5 ± 21.2

47.3 [35.8–63.5]

< 0.001

< 0.001

< 0.001

< 0.001

P4 (ng/ml)

0.22 ± 0.16

0.20 [0.10–0.30]

0.38 ± 0.22

0.30 [0.20–0.50]

0.87 ± 0.28

0.90 [0.70-1.00]

< 0.001

< 0.001

< 0.001

< 0.001

  1. Notes: 72 h: Ovulation within 72 h group; 48 h: Ovulation within 48 h group; 24 h: Ovulation within 24 h group; N: number of records in each group; p.overall: overall p value; p.72 h vs. 48 h: p value of comparison between the 72 h group and the 48 h group; p.72 h vs. 24 h: p value of comparison between the 72 h group and the 24 h group; p.48 h vs. 24 h: p value of comparison between the 48 h group and the 24 h group; p values of all post-hoc comparisons were adjusted. E2: estrogen level; LH: luteinizing hormone level; P4: progesterone level. Statistical description of hormone levels including estrogen, luteinizing hormone and progesterone were presented by both mean ± standard deviation and median [interquartile range] because of their non-normally distribution