Endometriosis and its coexistence with irritable bowel syndrome and pelvic inflammatory disease: findings from a
H E Seaman1, K D Ballard, J T Wright
1Department of Pharmacoepidemiology, Postgraduate Medical School, Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK.
Objective:
To investigate whether the increased chances of having a diagnosis of irritable bowel syndrome (IBS) and pelvic inflammatory disease (PID) in women with endometriosis is due to misdiagnosis or co-morbidity.
Design:
A case-control study of women aged 15-55 years with endometriosis and matched controls.
Setting:
Data from the UK's General Practice Research Database for the years 1992-2001.
Sample:
A total of 5540 women aged 15-55 years, diagnosed with endometriosis, each matched to four controls without endometriosis. The index date was defined as the date of diagnosis.
Methods:
Data were analysed to determine whether women with endometriosis were more likely to receive a diagnosis of PIDor IBS than women without endometriosis. Odds ratios were calculated for endometriosis associated with IBS and PID before and after the index date.
Main Outcome Measures:
Diagnosis of IBS or PID before and after the index date.
Results:
Compared with the controls, women with endometriosis were 3.5 times more likely to have received a diagnosis of IBS (OR 3.5 [95% CI: 3.1-3.9]). Even after women had been diagnosed with endometriosis, they were still two and a half times more likely to receive a new diagnosis of IBS when compared with the controls (OR 2.5 [95% CI: 2.2-2.8]). Similarly, women with endometriosis were more likely than those without endometriosis to have been treated for PID both before (OR 5.9 [95% CI: 5.1-6.9]) and after (OR 3.8 [95% CI: 3.1-4.6]) being diagnosed with endometriosis.
Conclusions:
Women with endometriosis are more likely to be diagnosed with IBS and PID than controls, even after a definitive diagnosis of endometriosis has been reached.
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