Table 1. Comparison of Characteristics of the Two Groups in the First Cycle ^a .

Group	Group a (n=32) Mean ± MD	Group b (n=27) Mean ± MD	P
Age	21.95 ± 3.01	21.40 ± 2.45	0.631b
BMI	20.62 ± 2.60	20.20 ± 4.08	0.760b
Menarche	13.44 ± 0.98	13.04 ± 1.35	0.191b
Menstrual intervalsا	26.16 ± 4.14	26.20 ± 2.89	0.9000b
Bleeding duration	6.50 ± 1.42	6.40 ± 1.17	0.852b
Family history of PD	No., (%)	No., (%)	0.185 c
Have	12 (66.7)	(45.5) 5
Haven't	6 (33.3)	6 (54.5)

^a Values are given as mean ± SD or number (percentage) unless otherwise indicated

^b ANOVA

^cPearson Chi-Square test using exact P-value