A UK study provides new evidence that working very long hours (more than 55 hours/week) is associated with an increased risk of depression among women. Moreover, working weekends was found to be associated with an increased risk of depression in both sexes.
Investigators note that the expansion of the global economy and the expansion of gig economies (employment by independent contractors for defined time intervals) has driven the need to work outside standard office hours.
These non-traditional occupational settings have been linked to poorer physical health. However, the potential impact on mental health is less well known. And research to date has largely focused on men and/or on specific jobs, say researchers.
The study seeks to provide insight on these area with researchers using data from Understanding Society, the UK Household Longitudinal Study (UKHLS). This tool has been tracking the health and well-being of a representative sample of 40,000 households across the UK since 2009.
Researchers focused on data for 11,215 men and 12,188 women from the second wave of the UKHLS in 2010-12 as this included information on employment. Depressive symptoms were measured using a validated general health questionnaire (GHQ-12).
Using the standard working week of 35 to 40 hours as a reference, working weeks were categorized as fewer than 35 to include part-time employees; 41-55 (long working hours); and 55 and above (extra-long working hours).
The researchers factored in several potentially influential contributors: age; marital status; parenthood; earnings and satisfaction with them; long term health conditions; job type and satisfaction with it; degree of control; and qualifications.
Investigators discovered that generally, older workers, smokers, and those who earned the least and who had the least job control were more depressed — this finding applied to both sexes.
However, gender differences in working patterns were evident.
Men tended to work longer hours than women, with almost half clocking up more than the standard quota compared with fewer than one in four women. And nearly half of the women worked part time compared with just one in seven (15 percent) men.
Married women who were also parents tended not to work longer hours, but the opposite was true of married fathers. Over two-thirds of men worked weekends compared with around half the women.
Investigators did not discover a difference in the number of depressive symptoms between men who put in fewer or more hours than the standard working week.
But weekend working was associated with significantly more depressive symptoms among men when work conditions were accounted for; among women, depressive symptoms were associated with the number of weekends worked.
And women who worked 55 or more hours a week and/or who worked most/every weekend had the worst mental health of all, with significantly more depressive symptoms than women working standard hours.
By way of an explanation, the researchers suggest that women are more likely to work longer hours in male dominated occupations, while those working weekends tend to be concentrated in low paid service sector jobs.
“Such jobs, when combined with frequent or complex interactions with the public or clients, have been linked to higher levels of depression,” they write.
“Our findings of more depressive symptoms among women working extra-long hours might also be explained by the potential double burden experienced by women when their long hours in paid work are added on their time in domestic labor,” investigators suggest.
“Previous studies have found that once unpaid housework and caring is accounted for, women work longer than men, on average, and that this has been linked to poorer physical health,” they add.
Investigators note that the findings reflect information gained from an observational study, and as such, can’t establish cause. But, the researchers nevertheless conclude:
“Our findings should encourage employers and policy makers to consider interventions aimed at reducing women’s burdens without restricting their full participation in the workforce, and at improving psychosocial work conditions.”
The study appears online in the Journal of Epidemiology & Community Health, an imprint of BMJ.
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