Meta-analysis of studies examining long-term construction injury rates

Background: The construction industry is one of the employment sectors with the highest risk of injuries. Aims: To evaluate the injury trend in the construction industry from data published from 1987 to 2010.MethodsAll papers with at least two measurements of injuries within a medium- to long-term period were included. The numbers of fatal and non-fatal injuries were examined in two separate groups: 100 000 workers per year and 200 000 worked hours per year. Results: All injuries significantly decreased between the first and the second measurement, with fatal injuries decreasing by 35% and non-fatal ones by 33% in workers/year and by 22% in worked hours/year. There was high heterogeneity among the sources of data for workers/year index (I2 = 49% for fatal injuries, 99% for non-fatal injuries) but no heterogeneity for worked hours/year index (I2 = 0). Meta-regression analysis showed a significant linear relationship between time and risk reduction for fatal injuries (r = 0.63; P < 0.001; a 6% reduction per year); trend reduction for non-fatal injuries was not related to the time taken between the measurements. Conclusions: Fatal injuries have a reduction trend that depends on large interventions, whereas non-fatal injuries are more prone to episodic changes. Furthermore, while the workers/year index allows easier evaluation of the injury rate variation in a single working environment, the worked hours/year index is better at comparing the injury rate variation in different working environments because it reduces the sources of heterogeneity. © The Author 2012. Published by Oxford University Press. All rights reserved.