Table 4.

Regression analysis evaluating the association between occurrence of dysmenorrhea and onset of dysmenorrhea in women with endometriosis compared to control women.

	Women with dysmenorrhea (now or in the past) (N = 511)	Women without dysmenorrhea ever (N = 568)	p-value*	Adjusted Odds ratio	95%CI
Having had or having dysmenorrhea (N/%)	545	534	<0.001
Never	35 (6.42%)	155 (29.03%)		0.17	0.06–0.45
Yes, but now no dysmenorrhea	159 (29.17%)	219 (41.01%)		0.26	0.09–0.67
Yes	351 (64.41%)	160 (29.96%)		5.74	3.82–7.22
Onset of dysmenorrhea (N/%)	485	292	<0.001
Yes, onset at menarche	219 (45.15%)	127 (43.49%)		2.35	1.44–3.88
Yes, onset 2–3 years after menarche	92 (18.97%)	71 (24.32%)		2.38	1.41–4.07
Yes, onset >3 years after menarche	174 (35.88%)	94 (32.19%)		3.41	2.09–5.64

^*The bold p-values indicate the statistical significance in the bivariate analysis, significant p-values are Bonferroni corrected α = 0.01.