. 2021 Aug 20;21:169. doi: 10.1186/s12902-021-00824-4

Table 1.

Demographic, anthropometric, and reproductive features in the two groups at the time of entering the study

Variables	Metformin Group (n = 83)	Placebo Group (n = 92)	p-value
Age	39.90 ± 10.54	39.42 ± 10.14	0.76^a
Body mass Index (BMI)	25.51 ± 4.72	26.36 ± 6.95	0.35^a
Waist/hip ratio	0.86 ± 0.07	0.86 ± 0.13	0.75^a
Age of menarche	13.13 ± 1.33	13.32 ± 1.39	0.37^a
Parity	1.53 ± 1.13	1.51 ± 1.10	0.91^a
Age at first delivery	16.99 ± 11.12	18.35 ± 10.73	0.41^a
History of twin pregnancy	2 (2.4)	4 (4.3)	0.48^b
History of abortion	0.45 ± 0.80	0.25 ± 0.59	0.07^a
History of breastfeeding	60 (72.3)	70 (76.1)	0.57^b
History of Infertility	7 (8.4)	7 (7.7)	1^b
History of PCO	4 (4.8)	2 (2.2)	0.34^b
History of OCP use	25 (30.1)	26 (28.3)	0.79^b
History of HRT use	6 (7.2)	5 (5.4)	0.52^b

^a Independent Student t-test. ^b Chi-square test. PCO polycystic ovarian disease, OCP oral contraceptive, HRT hormone replacement therapy