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. Author manuscript; available in PMC: 2012 Aug 1.
Published in final edited form as: Fertil Steril. 2011 Jun 29;96(2):360–365. doi: 10.1016/j.fertnstert.2011.05.087

Table 3.

Incidence of endometriosis by diagnostic method, cohort and site, ENDO Study, 2007–2009 (n=473).

Cohort and Diagnostic Method California Incidence Rate (%) Utah Incidence Rate (%) Total Incidence Rate (%)
Operative cohort
Any surgical visualization 17/61=28 175/412=42 192/473=41
Histologically confirmed visualized endometriosis 6/26=23 61/117=52 67/143=47
Histologically confirmed only – no surgical visualization 0/26=0 1/117=0.9 1/143=0.7
Magnetic resonance imaging (MRI) only 1/10=10 6/86=7 7/96=7
Any surgical visualization + MRI diagnosis 1/10=10 18/90=20 19/100=19
Any surgical visualization + MRI + histologically confirmed diagnosis 0/2=0 11/30=37 11/32=34
Population cohort
Magnetic resonance imaging only 3/33=9 11/94=12 14/127=11

NOTE: Denominators for estimating incidence vary depending upon the number of women undergoing surgery and/or specimens sent to histopathology and by MRI randomization status. Excludes 22 women (2 in California and 20 in Utah) whose surgeries were canceled.