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

Table 3 Association between pubertal timing and menstrual characteristics and dysmenorrhea (N = 940)

	Crude			Adjusted
	OR (95%CI)	R^2*	P value	OR (95%CI)	R^2*	P value
Age groups at thelarche year)		0.000			0.047
Normal thelarche (11–13)	Ref.			Ref.
Early thelarche (≤10)	0.99(0.74, 1.32)		0.935	0.95(0.70, 1.28)		0.729
Late thelarche (≥ 14)	1.19(0.53, 2.68)		0.680	1.36 (0.57, 3.24)		0.490
Age group at menarche (year)		0.001			0.047
Normal menarche (12–15)	Ref.			Ref.
Early menarche (< 12)	0.93(0.60, 1.43)		0.740	0.95(0.60, 1.49)		0.817
Late menarche (≥ 16)	0.74(0.43, 1.27)		0.272	0.85(0.48, 1.52)		0.588
Ever diagnosed with precocious puberty		0.003			0.050
No	Ref.			Ref.
Yes	0.58(0.32, 1.05)		0.070	0.50(0.26, 0.94)		0.031
Regular menstrual cycle in the past 12 months	0.000			0.046
No	Ref.			Ref.
Yes	0.92(0.71, 1.19)		0.520	0.93(0.70, 1.23)		0.625
Regular menstrual periods in the past 12 months		0.001			0.047
No	Ref.			Ref.
Yes	1.19(0.91, 1.57)		0.200	1.18(0.88, 1.57)		0.267
Menstrual quantity in the past 12 months (amount of bleeding)		0.012			0.061
Little	Ref.			Ref.
Moderate	1.41(1.02, 1.93)		0.036	1.33(0.95, 1.86)		0.094
Heavy	1.67(1.03, 2.69)		0.036	1.63(0.99, 2.68)		0.053
Heavy with large clots	3.86(1.81, 8.23)		0.000	5.01(2.26,11.10)		0.000
Menstrual flow length in the past 12 months (days)		0.001			0.047
< 3	Ref.			Ref.
3–7	1.91(0.58, 6.26)		0.283	1.93(0.57, 6.54)		0.288
> 7	1.92(0.52,7.05)		0.328	1.94(0.51, 7.45)		0.333

Statistically significant values are given in bold
OR, odds ratio; CI, confidence interval; R^2*, pseudo-R²; 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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