Cross-sectional association between long working hours and endoscopic gastritis: the Kangbuk Samsung Health Study

Sep 4, 2021BMJ open

Link between long working hours and stomach inflammation seen with endoscopy

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Abstract

Approximately 93.2% of participants had positive .

There is a significant association between longer working hours and positive endoscopic gastritis findings.
Participants working more than 55 hours per week had a multivariate prevalence ratio of 1.011 for endoscopic gastritis compared to those working 35-40 hours per week.
Subtypes of gastritis, including superficial, erosive, atrophic, intestinal metaplasia, and haemorrhagic gastritis, were increasingly observed with longer working hours.
The prevalence ratios for various gastritis subtypes in participants working more than 55 hours per week ranged from 1.019 to 1.177 compared to those working 35-40 hours per week.
Findings suggest a potential increase in the risk of multiple gastritis types among workers with extended working hours.

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OBJECTIVES: This study aimed to determine the cross-sectional association between long working hours and gastritis diagnosed by endoscopy.

DESIGN: Cross-sectional study.

SETTING: Large university hospitals in Seoul and Suwon, South Korea.

PARTICIPANTS: Workers in formal employment who underwent a comprehensive health examination at the Kangbuk Samsung Hospital Total Healthcare Centre clinics in Seoul and Suwon, South Korea, between January 2011 and December 2018. Of the 386 488 participants, 168 391 full-time day workers met the inclusion criteria and were included in the analysis.

PRIMARY OUTCOME MEASURE: .

RESULTS: The participants were predominantly college graduates or above (88.9%), male (71.2%) and in their 30s (51.1%), and the median age was 36 (IQR 31-42). Approximately 93.2% of participants had positive endoscopic gastritis, and there was a significant association between working hours and positive findings of endoscopic gastritis. The multivariate fully adjusted prevalence ratio (PR) of endoscopic gastritis for participants working >55 hours per week compared with 35-40 hours per week was 1.011 (95% CI 1.007 to 1.015). Furthermore, endoscopic findings were classified into nine subtypes of gastritis, including superficial gastritis, erosive gastritis, atrophic gastritis, intestinal metaplasia and haemorrhagic gastritis increased with longer working hours (p for trends <0.05). Their PRs for participants working >55 hours per week compared with 35-40 hours per week were 1.019 (95% CI 1.012 to 1.026), 1.025 (95% CI 1.011 to 1.040), 1.017 (95% CI 1.008 to 1.027), 1.066 (95% CI 1.028 to 1.105) and 1.177 (95% CI 1.007 to 1.375), respectively.

CONCLUSIONS: Working over 55 hours per week was cross-sectionally associated with positive findings of endoscopic gastritis. The study findings indicated potentially increased risks of superficial gastritis, erosive gastritis, atrophic gastritis, intestinal metaplasia and haemorrhagic gastritis among workers with long working hours (>55 hours per week), supporting the need for further exploration via longitudinal studies.

Key numbers

1.011

Prevalence Ratio for

Participants working >55 hours per week vs. 35-40 hours per week

1.019

Prevalence Ratio for Superficial Gastritis

Participants working >55 hours per week vs. 35-40 hours per week

1.177

Prevalence Ratio for Haemorrhagic Gastritis

Participants working >55 hours per week vs. 35-40 hours per week

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Cross-sectional association between long working hours and endoscopic gastritis: the Kangbuk Samsung Health Study

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