Current situation of menstruation and gynecological diseases prevalence among Chinese women: a cross-sectional study

Table 6 Association between pubertal timing and menstrual characteristics and ovarian dysfunction (N = 940)

	Crude			Adjusted
	OR (95%CI)	R^2*	P value	OR (95%CI)	R^2*	P value
Age group at thelarche (year)		0.011			0.075
Normal thelarche (11–13)	Ref.			Ref.
Early thelarche (≤ 10)	1.78(1.16, 2.74)		0.008	1.96(1.25, 3.08)		0.004
Late thelarche (≥ 14)	1.41(0.41, 4.88)		0.583	1.27(0.34, 4.76)		0.724
Age group at menarche (year)		0.011			0.078
Normal menarche (12–15)	Ref.			Ref.
Early menarche (< 12)	2.13(1.21, 3.74)		0.009	2.26(1.24, 4.13)		0.008
Late menarche (≥ 16)	0.64(0.22, 1.80)		0.394	0.41(0.14, 1.23)		0.113
Ever diagnosed with precocious puberty		0.014			0.073
No	Ref.			Ref.
Yes	3.04(1.56, 5.91)		0.001	2.79(1.36, 5.74)		0.005
Regular menstrual cycle in the past 12 months		0.003			0.064
No	Ref.			Ref.
Yes	0.74(0.48, 1.14)		0.170	0.76(0.48, 1.21)		0.254
Regular menstrual periods in the past 12 months		0.006			0.066
No	Ref.			Ref.
Yes	0.67(0.44, 1.01)		0.056	0.71(0.46,1.09)		0.120
Menstrual quantity in the past 12 months (amount of bleeding)		0.003			0.069
Little	Ref.			Ref.
Moderate	0.86(0.53, 1.39)		0.532	0.78(0.47, 1.29)		0.324
Heavy	0.77(0.36, 1.66)		0.503	0.75(0.34, 1.67)		0.480
Heavy with large clots	0.40(0.09, 1.76)		0.225	0.25(0.05,1.14)		0.074
Menstrual flow length in the past 12 months (days)		0.003			0.066
< 3	Ref.			Ref.
3–7	0.69(0.15, 3.17)		0.635	0.60(0.12, 2.87)		0.519
> 7	0.35(0.05, 2.36)		0.282	0.26 (0.04, 1.86)		0.178

Statistically significant values are given in bold
OR, odds ratio; CI, confidence interval; R^2*, pseudo-R^2*; p < 0.05. N was after excluding the participants with missing values in age. Adjusted OR (95%CI) was obtained after adjusting for age, race, education, working hours, and BMI, Body Mass Index.

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