. 2022 Jun 1;11:470. Originally published 2022 Apr 28. [Version 2] doi: 10.12688/f1000research.111999.2

Table 4. Presenteeism among study groups measured by Stanford Presenteeism Scale (SPS-6).

Presenteeism	Train drivers n=100	Comparison group n=100	Test of significance and P value
Presenteeism	N (%)	N (%)	Test of significance and P value
Presenteeism
Present	76(76)	31(31)	χ ²=40.7 P≤0.001
Absent	24(24)	69(69)	χ ²=40.7 P≤0.001
SPS-6 score ^d
≤18	54(71.1)	13(41.9)	χ ²=7.98 P=0.005
>18	22(28.9)	18(58.1)	χ ²=7.98 P=0.005
Mean ±SD	15.7 ±3.7	19.2±2.9	t=4.8, P≤0.001

^{^d}

Percentage within presenteeism. SD=standard deviation.