an increasing trendp< 0.001
Although there were no differences in the rate of LTSA during the study period by occupation ( p= 0.135), technical workers showed an increasing trend in the rate of LTSA (0.87% [95%CI: 0.65 to 1.12] in 2011 to 1.12% [0.88 to 1.63] in 2018, [ p< 0.001, for the trend test]).