BACKGROUND: A cross-sectional study has reported that @entity3406 @entity566 is associated with @entity46 . However, causal studies of this association are limited. OBJECTIVE: The objective of this study was to compare the prevalence of @entity3406 @entity566 in @entity1 with and without @entity46 . METHODS: We used a National Health Insurance Service (NHIS) sample cohort dataset that included approximately 1 million individuals from South Korea; the data were obtained between January 01, 2002, and December 31, 2013. We selected the @entity46 group according to diagnosis code (N80.X), surgery codes, and drug codes during the years 2009~2013. The controls were randomly matched to the @entity46 @entity1 at a ratio of 4:1 by age and socioeconomic status. @entity1 with @entity3406 @entity566 were defined in the cohort dataset as those with a simultaneous diagnosis code (L23.0) and patch test code during 2002~2008. RESULTS: In total, 4,985 @entity1 were selected from the NHIS cohort database and divided into an @entity46 group (997 @entity1 ) and a control group (3,988 @entity1 ). The number of @entity1 with @entity3406 @entity566 in the @entity46 group was eight (0.8%), and that in the control group was thirteen (0.3%). After adjustment for age and socioeconomic status, the rate of @entity3406 @entity566 in was higher in the @entity46 group than in the control group [odds ratio: 2.474; 95% confidence interval: 1.023~5.988; p = 0.044]. CONCLUSIONS: We found that @entity3406 @entity566 is a risk factor for @entity46 .

XXXX Allergy Is a Risk Factor for Endometriosis: An 11-Year Population-Based Nested Case-Control Study.

@entity3406 :: ('MESH:D009532', 'Chemical') :: ['nickel'] @entity566 :: ('MESH:D006967', 'Disease') :: ['allergy'] @entity1 :: ('9606', 'Species') :: ['women', 'Patients', 'patients'] @entity46 :: ('MESH:D004715', 'Disease') :: ['endometriosis']
@entity3406 :: (MESH:D009532,Chemical) :: ['Nickel']
