Annals of Occupational and Environmental Medicine

Research Article

Sleepiness while driving and shiftwork patterns among Korean bus drivers: Seyoung Lee, Hyoung-Ryoul Kim, Junsu Byun, Taewon Jang; Ann Occup Environ Med 2017;29:48. Published online October 9, 2017; DOI: https://doi.org/10.1186/s40557-017-0203-y

Background

Sleepiness while driving has been regarded as a major cause of death due to traffic accidents. We compared the degree of sleepiness across five different working time periods (first, morning, post-lunch, afternoon, and last) among Korean bus drivers with different shift types (Daily two shift/Alternating day shift).

Method

We interviewed 332 bus drivers with two shift types (Daily two shift, 128; Alternating day shift, 204). The questionnaire included demographic information (age, alcohol consumption and history of disease), a sleep disorder diagnosed by a doctor, job duration, the number of workdays in the past month, average working hours per workday and week, sleepiness while driving (Karolinska Sleepiness Scale), and sleeping time for both workdays and off-days. We conducted log-binomial regression analyses and produced prevalence ratios (PRs) of severe sleepiness (KSS ≥ 7) while driving with 95% confidence intervals (95% CI) to identify the difference in sleepiness for five working times between both groups.

Results

For the first and morning periods, there were no statistically significant differences in the KSS scores between the two groups. However, from lunch to last driving, drivers with Alternating day shift had a much larger proportion of severe sleepiness than those on Daily two shift. Thirteen (10.2%), 2 (1.6%) and 7 (5.5%) Daily two shift workers reported severe sleepiness in the post-lunch, afternoon and last periods. In contrast, 81 (39.7%), 63 (30.9%) and 64 (31.4%) of Alternating day shift drivers experienced severe sleepiness during the post-lunch, afternoon and last driving periods (p < 0.0001). According to the log-binomial regression analyses, Alternating day shift was associated with severe sleepiness from lunch to last driving. After adjusting for job duration, alcohol consumption and sleeping time on workdays, the PRs were 3.97 (95% CI: 2.29–6.90) post-lunch, 18.26 (95% CI: 4.51–73.89) in the afternoon and 5.71 (95% CI: 2.51–12.99) for the last driving period.

Conclusion

We found that Alternating day shift bus drivers suffered from more sleepiness while driving from lunch to last driving than Daily two shift bus drivers. This difference may be because Alternating day shift drivers had more irregular work schedules and longer working hours per day and week.

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Original Article

Daytime Sleepiness and Fatigue in Male Adults in relation to Shift Work: Kyung Hyun Son, Soo Geun Kim, Young Woo Jin, Sung Hyo Kim, Soon Young Kim, Yoo Soon Bang, Sun Seog Kweon, Min Ho Shin, Seul Ki Jeong, Hae Sung Nam; Korean Journal of Occupational and Environmental Medicine 2005;17(3):199-207. Published online September 30, 2005; DOI: https://doi.org/10.35371/kjoem.2005.17.3.199

Abstract PDF

OBJECTIVES
The purpose of this study was to examine daytime sleepiness-related factors, including sleeping patterns and daytime activities, in shift and non-shift workers.
METHODS
One hundred and twenty two shift workers, and two hundred and fifty four non-shift workers, were selected and identified in terms of their general characteristics, such as age, tenure, educational level, marital status and religion. Screening questionnaires were composed of the Epworth Sleepiness Scale (ESS) for evaluation of daytime sleepiness, the Multidimensional Fatigue Scale (MFS) for fatigue, and the Korean version of the National Institute for Occupational Safety and Health (NIOSH) for sleeping patterns.
RESULTS
The shift worker group reported significantly higher rates of sleep disturbance and higher fatigue scores compared with the non-shift workers (all p<0.01). The prevalence of daytime sleepiness was higher in the shift workers (19.7%) than the non-shift workers (10.6%) (p<0.05). The significant daytime sleepiness-related factors were found to be shift work, tenure and difficulties in falling back to sleep once woken (p<0.05). Shift work was proved to be an important factor in workers aged less than 40 years (p<0.05). However, this association was not evident in workers aged 40 years and over.
CONCLUSIONS
The shift workers showed a significantly higher prevalence of daytime sleepiness compared with the non-shift workers. The present study suggests a need for the implementation of sleeping and fatigue management programs for shift workers in order to improve working efficiency and control safety accidents during shift work.

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Original Article

The relationship of working hours and work intensity with sleep disturbance among continuous 12 hours day and night shift workers in the automobile factory in Korea: Mia Son; Korean Journal of Occupational and Environmental Medicine 2004;16(1):13-24. Published online March 31, 2004; DOI: https://doi.org/10.35371/kjoem.2004.16.1.13

Abstract PDF

BACKGROUND
S: The objective of this study is to explore the relationships of working hours and work intensity with sleep disturbance among 12-hour shift workers in the automobile factory in Korea.
METHODS
A questionnaire and a sleep diary were distributed among 2200 (25% of total workers) and 300 workers who were randomly selected in the 8700 workers in one car factory. Among the 300 randomely selected workers, who were randomly selected, 262 workers filled out a sleep diary. For a questionnaire, 2200 (25%) among 8700 workers were randomly selected, 1200 (54% response rate) of whom filled out the questionnaire. The cross-sectional questionnaire and the sleep diary during 14 consecutive days were distributed and collected by workers' representatives, who were trained for the participatory action research in this study. One hundred and sixty workers' sleep diaries and questionnaires were merged by the same worker and used for the analysis in this study. Logistic regression analysis for repeated measurements was modeled using the prevalence of severe sleepiness at work (i.e. Karonlinska Sleepiness Scale 7 or higher) as dependent variable and working hours, sleep pattern, work intensity and health behaviours as independent variables.
RESULTS
The prevalence of severe sleepiness at the end of work was more than 60% after finishing night shift in the automobile factory. The main risk factors related to the severe sleepiness at the end of work were the night shift, long working hours more than 10 hours, the higher frequency of night shift per month, less free time between shifts, poor quality of sleep, deficit of sleeping hours and intensified work (reducing tendency of rest time per day and increasing tendency of additional working time) such as increasing tendency of absolute surplus value.
DISCUSSION
We suggest that the 12-hour shift system, long working hours, intensified work and poor quantity as well as quality of sleep were the main risk factors for the severe sleepiness among the shift workers in the automobile factory in Korea.

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