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Relationship between body mass index and the incidence of inguinal hernia repairs: a population-based study in Olmsted County, MN

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Abstract

Purpose

The relationship between body mass index (BMI) and the risk of inguinal hernia development is unclear. To explore the relationship, we determined whether the incidence of inguinal hernia repairs (IHR) varied across patients with different BMI categories.

Study Design

A population-based incidence study was undertaken. We reviewed all IHR performed on adult residents of Olmsted County, MN from 2004 to 2008. Cases were ascertained through the Rochester Epidemiology Project, a records-linkage system with more than 97 % population coverage.

Results

During the study period, a total of 1,168 IHR were performed on 879 men and 107 women. The median BMI of the cohort was 26.7 kg/m2 (range 14.9–58.1, interquartile range 23.9–28.9). Incidence rates varied significantly as a function of BMI (p < 0.001). Rates were highest among men who were either normal weight or overweight (419.8 and 421.1 per 100,000 person–years for BMI < 25 and BMI 25–29.9, respectively), and lowest for obese and morbidly obese men (273.5 and 99.4 per 100,000 person–years for BMI 30–34.9 and BMI ≥ 35, respectively). Findings were similar across all age categories and in patients who had an IHR that was initial or recurrent, direct or indirect, and unilateral or bilateral.

Conclusions

The incidence of IHR decreased as BMI increased. Obese and morbidly obese patients had a lower incidence of IHR than those who were normal weight or overweight. The causal mechanisms leading to such a relationship are unclear and warrant further study.

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Abbreviations

IH:

Inguinal hernia

IHR:

Inguinal hernia repair

BMI:

Body mass index

REP:

Rochester Epidemiology Project

USA:

United States of America

H-ICDA:

Hospital adaptation of international classification of diseases

ICD-9:

International classification of diseases, 9th edition

CPT:

Current procedural terminology

NHANES:

National Health and Nutrition Examination Survey

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Acknowledgments

This publication was made possible by the Rochester Epidemiology Project (Grant Number R01 AG034676 from the National Institute on Aging) and by Grant Number 1 UL1 RR024150 from the National Center for Research Resources (NCRR), a component of the National Institutes of Health (NIH), and the NIH Roadmap for Medical Research. Its contents are solely the responsibility of the authors and do not necessarily represent the official view of NCRR or NIH.

Conflict of interest

BZ, TR, RH, CL, BG, and DF declare no conflicts of interest.

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Correspondence to D. R. Farley.

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Zendejas, B., Hernandez-Irizarry, R., Ramirez, T. et al. Relationship between body mass index and the incidence of inguinal hernia repairs: a population-based study in Olmsted County, MN. Hernia 18, 283–288 (2014). https://doi.org/10.1007/s10029-013-1185-5

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  • DOI: https://doi.org/10.1007/s10029-013-1185-5

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