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Table 2 Summary of the continuous characteristics of the workers

From: Experience and limited lighting may affect sleepiness of tunnel workers

Variable Mean SD
Age (years) 42,43 8,55
Shift years 13,7 7,75
Height (cm) 174,69 5,43
Weight (kg) 83,05 11,99
BMI (kg/m2) 27,23 3,88