• Shift work < Materials, exposures and occupational groups
• Gender < Methodology, speciality
• Meta-analysis < Methodology, speciality

In a meta-analysis, Gan et al 1 found a stronger association between shift work and diabetes for men than for women. In that meta-analysis, three studies contributed to the pooled estimate by 90% and nine studies by 10% only. Studies conducted among women were large-to-medium sized (3 studies, N=179 891), while studies conducted among men were small-to-medium sized (9 studies, N=24 629). It seems that gender difference in the magnitude of the association between shift work and diabetes is due to …