Work Schedule Irregularity and the Risk of Work-Related Injury among Korean Manual Workers

Association between irregular working hours and work-related musculoskeletal pain: results from the 6th Korean Working Conditions Survey

Background

Recently, irregular working hours have become controversial issues in Korea. The health impact of irregular working hours on the work-related musculoskeletal pain (MSP) is scarcely researched before. We sought to investigate the association between irregular working hours and work-related MSP among South Korean workers.

Methods

This study used data from the sixth Korean Working Conditions Survey in 2020. The prevalence of work-related MSP was analyzed using the χ2 test. A multiple logistic regression analysis was conducted to assess the association between irregular working hours and work-related MSP. We conducted stratified analysis by gender, weekly working hours, and workers' control over their working hours. We calculated the adjusted odds ratios (ORs) of work-related MSP for irregular working hours combined with weekly working hours.

Results

The OR for work-related MSP was significantly higher in the population with irregular working hours than in the population with regular working hours (OR: 1.43, 95% confidence interval [CI]: 1.29-1.58). Irregular and long (> 52 hours/week) working hours have the highest risk of work-related MSP in both genders (in men, OR: 3.48 [95% CI: 2.53-4.78]; in women, OR: 2.41 [95% CI: 1.46-4.00]).

Conclusions

Irregular working hours were associated with work-related MSP in Korea. The association was magnified with long working hours. Reform of the Korean Labor Standards Act leading to increase irregular working hours may induce adverse health outcome.

Shedding light on work-related and non-work-related hand injuries from the social work perspective

BACKGROUND

Upper extremity injuries may cause not only physical but also serious social and psychological problems in workers.

OBJECTIVE

The aim of this study was to compare demographic and work-related features of persons with hand injuries who sustained a work-related or a non-work-related injury to gain insights into possible predisposing factors for work-related injuries as well as psychosocial consequences of hand injuries from the social work perspective.

METHODS

This case-control study was conducted on 30 work-related and 30 non-work-related hand injury patients. The patients were evaluated using a questionnaire designed by the authors based on the principles of social work involving demographics, work-related features, thought-emotion-behaviour features, family and friend relationships, need for family support and professional psychosocial support. Survey data from both groups were statistically analysed using descriptive statistics, Chi-square and Fisher Exact test.

RESULTS

When compared with the non-work-related hand injury group, the majority of the subjects of the work-related hand injury group were blue-collar workers (p = 0.003), had a lower level of education (p < 0.001), worked off-the-clock (p = 0.015), held the employer responsible for the accident (p < 0.001), needed more time to return to work (p = 0.014), were worried about the future (p = 0.045), and expressed loss of joy (p = 0.004).

CONCLUSION

Hand injuries, regardless of their relation to work, lead to important psychosocial problems which need to be evaluated widely and carefully focusing on the patient and patient's environment, work environment in this case.

Irregular Work Hours and the Risk of Sleep Disturbance Among Korean Service Workers Required to Suppress Emotion

Although a necessity in a modern society, irregular work schedule can lead to sleep problems. We investigated the effect of work schedule irregularity on sleep disturbance of 17,846 Korean service workers using the fifth Korean Working Conditions Survey. The odds ratio (OR) and 95% confidence interval (CI) for sleep disturbance occurrence were calculated through a multiple logistic regression model. The adjusted ORs for moderate and severe sleep disturbances for those with irregular work hours were 2.11 (95% CI 1.90–2.33) and 3.10 (95% CI 2.62–3.66), respectively. Work schedule irregularity and emotion suppression at work showed synergistic effect on both moderate and severe sleep disturbances. Sleep disturbances can lead to brain function deterioration and work-related injuries; therefore, appropriate measures should be addressed for the vulnerable population.