Objective To develop a core outcome set for endometriosis. Design Consensus development study. Setting International. Population One hundred and sixteen healthcare professionals, 31 researchers and 206 patient representatives. Methods Modified Delphi method and modified nominal group technique. Results The final core outcome set includes three core outcomes for trials evaluating potential treatments for pain and other symptoms associated with endometriosis: overall pain; improvement in the most troublesome symptom; and quality of life. In addition, eight core outcomes for trials evaluating potential treatments for infertility associated with endometriosis were identified: viable intrauterine pregnancy confirmed by ultrasound; pregnancy loss, including ectopic pregnancy, miscarriage, stillbirth and termination of pregnancy; live birth; time to pregnancy leading to live birth; gestational age at delivery; birthweight; neonatal mortality; and major congenital abnormalities. Two core outcomes applicable to all trials were also identified: adverse events and patient satisfaction with treatment. Conclusions Using robust consensus science methods, healthcare professionals, researchers and women with endometriosis have developed a core outcome set to standardise outcome selection, collection and reporting across future randomised controlled trials and systematic reviews evaluating potential treatments for endometriosis. Tweetable abstract @coreoutcomes for future #endometriosis research have been developed @jamesmnduffy.

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STUDY QUESTION What is the performance of the patient-centredness of endometriosis care in a secondary and a tertiary care setting and how can it be improved? SUMMARY ANSWER Overall, patient-centredness was comparable in the two endometriosis care centres, but differed regarding ‘physical comfort’ and ‘continuity and transition’; both centres can learn how to improve several of their targets from the other’s strengths. WHAT IS KNOWN ALREADY The ENDOCARE questionnaire (ECQ) is a validated questionnaire for assessing the important quality dimension ‘patient-centredness’. Patient-centredness is associated with quality of life, although this should be explored further by larger-scale studies. STUDY DESIGN, SIZE, DURATION A cross-sectional survey, relying on the ECQ, was performed (during 2015 and 2016) among 407 women with surgically diagnosed endometriosis. PARTICIPANTS/MATERIALS, SETTING, METHODS This study was conducted in a secondary and a tertiary care centre in the Netherlands. A total of 209 Dutch-speaking women who had endometriosis surgery (2013–2014), completed the ECQ after a postal invitation and, if needed, postal reminders. The assessed outcomes were: overall patient-centredness, the patient-centredness for each of its 10 dimensions, and the patient-centred strengths and targets for improvement. Case-mix adjusted patient-centredness scores (PCS) were compared and strengths and targets for improvement were identified with a matrix modelling importance against experience. The need to improve the targets was quantified with quality impact indices. MAIN RESULTS AND THE ROLE OF CHANCE No difference was demonstrated between the overall PCS of the secondary and tertiary centres (respectively: 4.8 and 4.5; P = 0.15). No difference was found in PCS per dimension between the two clinics except for the secondary care centre performing better regarding ‘physical comfort’ (respectively: 4.5 and 3.0; P = 0.01) and ‘continuity and transition’ (respectively: 6.0 and 4.2; P = 0.01). The two centres had nine targets for improvement in common. The secondary and tertiary centres, respectively, had five and seven additional centre-specific targets for improvement. Cross-centre learning is encouraged as 9 out the 12 additional centre-specific targets were strengths in the other centre. The main improvement targets were being able to contact the centre in case of emergency (both centres), the involvement of a significant other (secondary centre), diagnostic delay (secondary centre), personal follow-up (tertiary centre) and disclosing the level of competence of healthcare providers (tertiary centre). LIMITATIONS, REASON FOR CAUTION Responders did not differ from non-responders in their stage of endometriosis, educational level, rating of endometriosis care and degree to which their complaints are suppressed. Endometriosis is a chronic condition and patient-centredness might be experienced differently at other points of the endometriosis care trajectory. WIDER IMPLICATION OF THE FINDINGS The ECQ is a useful tool to assess patient-centredness in both secondary and tertiary care centres. Further research should focus on how to improve endometriosis care. STUDY FUNDING/COMPETING INTEREST(S) No external funding was used. V.M. and C.B.L. report grants from Guerbet, grants from Merck and grants from Ferring outside the submitted work. All authors declare that they have no competing interests concerning this publication.

Performing intrauterine insemination (IUI) in moderate-to-severe endometriosis patients is not implemented in international guidelines, as only limited data exist on treatment efficacy and safety. This retrospective study examined the efficacy and safety of two IUI treatment strategies performed between January 2007 and July 2012 in moderate-to-severe endometriosis patients. Eight (40.0%) versus seven (15.6%) ongoing pregnancies were accomplished in patients undergoing IUI with ovarian stimulation (n=20, 61 cycles) versus IUI without ovarian stimulation in the first three cycles followed by IUI with ovarian stimulation (IUI with natural/ovarian stimulation; n=45, 184 cycles). Preceding long-term pituitary down-regulation tended to result in a higher ongoing pregnancy rate (adjusted HR 1.8) and a higher chance of endometriosis recurrence (adjusted HR 2.3). Eight (40.0%) versus 16 (35.6%) recurrences of endometriosis complaints were reported in patients receiving IUI with ovarian stimulation versus IUI with natural/ovarian stimulation. IUI might be a valuable treatment in moderate-to-severe endometriosis patients and IUI with ovarian stimulation should be offered over IUI with natural/ovarian stimulation. Preceding long-term pituitary down-regulation might positively influence the ongoing pregnancy rate and can be considered. Whether this treatment strategy can be structurally offered prior to IVF must be investigated in a randomized controlled trial.