Table 2.

Right – left differences in ultrasonographic features in controls and women with PCOS

	Right Ovary	Left Ovary	MD ± SE (95% CI)	Correlation
PCOS (n = 87)
FNPO	45 (33–69)	43 (32–54)	5 ± 2 (1, 8)*	0.73*
FNPS	11 (8–13)	10 (7–12)	1 ± 0 (0, 2)*	0.57*
OV	13 (9–17)	10 (7–14)	3 ± 1 (2, 4)*	0.59*
Control (n = 67)
FNPO	23 (16–32)	24 (15–33)	0 ± 1 (−2, 2)	0.68*
FNPS	7 (4–10)	7 (5–9)	0 ± 0 (−1, 1)	0.48*
OV	8 (6–11)	6 (4–9)	2 ± 1 (1, 3)*	0.31*

Data are presented as median (interquartile range) unless otherwise specified and reflect recorded values from individual ovaries rounded to the nearest whole number. The mean difference (MD) reflects the right minus the left ovary. Therefore, a positive number reflects a larger value in the right ovary.

^*An asterisk reflects a significant mean difference (based on Wilcoxon Signed Rank Tests) or correlation (based on Spearman’s rank coefficient) between ovaries, p < 0.05.

Abbreviations: FNPO, follicle number per ovary; FNPS, follicle number per cross-section; OV, ovarian volume; MD, mean difference; SE, standard error; CI, confidence interval.