Table 1.

Baseline characteristics

Parameter
Demography	N	years, mean ± SD
Age at registration	887	34.4 ± 7.6
History of endometriosis	N	%
Onset of first symptomsa
<1 year ago	407	45.9
Between 1 and 5 years ago	273	30.8
>5 years ago	206	23.2
Missing	1	0.1
Most common symptoms of endometriosisb
Dysmenorrhea	720	81.2
Chronic pelvic pain	304	34.3
Dyspareunia	55	6.2
Subfertility	44	5.0
Time point of first diagnosisa
<1 year ago	651	73.4
Between 1 and 5 years ago	145	16.4
>5 years ago	91	10.3
Method of diagnosisb
Surgical diagnosis	621	70.0
Clinical diagnosis	560	63.1
Endometriosis lesions (n = 777 evaluable patients)
Single	425	54.7
Multi	352	45.3
Endometriosis localization (n = 737 evaluable patients)b
Ovary	650	88.2
Pelvic organ	287	38.9
Extra pelvic	21	2.9
Prior endometriosis treatment	N	%
Patients without prior treatment	351	39.6
Patients with prior treatment	536	60.4
Type of treatment (n = 536)	N	%
Surgery	454	84.7
Hormonal treatment	186	34.7
Pain therapy	98	18.3
rASRM stage of endometriosis (n = 471)b,c	N	%
Stage I (minimal)	17	3.7
Stage II (mild)	25	5.5
Stage III (moderate)	92	20.3
Stage IV (severe)	130	28.6
Unknown	207	45.6
Most common previous diseases (n = 145)b	N	%
Uterine leiomyoma	71	49.0
Endometrial polyp	36	24.8
Ovarian cysts	26	17.9
Pelvic inflammatory disease	20	13.8
Most common concomitant diseases (n = 154)b	N	%
Adenomyosis	51	33.1
Uterine leiomyoma	42	27.3
Anemia	18	11.7

^aPartially missing dates were imputed by the earliest possible time point: In case that only the day was missing, the date was imputed as the first day of the month. In case that the day and the month were missing, i.e., only the year was available, the day and month was imputed by January 1st

^bMultiple answers possible

^crASRM was assessed for each individual surgery (n = 471 surgeries) in 454 patients with a prior surgical treatment for endometriosis. rASRM, revised American Society for Reproductive Medicine score