a decreasing trendP < 0.01
The incidence rates of injuries among production operation-transportation equipment personnel showed a decreasing trend (35.28 % in 2013 and 15.83 % in 2021; χ 2 = 1197.88, P < 0.01; Table 1 ). 3.2 Time of injury occurrence Over 1 year, injury occurrence rates among employees increased during summer and decreased during winter.