Table 3.

Correlation coefficients (P-values) for work environment parameters

	Driving	Precise work	Commuting	Before sleep	Sleep	Meeting	Physical labor
PC use	−0.229	−0.149	0.163	−0.115	−0.146	0.198	−0.251
	(<0.001)	(<0.001)	(<0.001)	(<0.001)	(<0.001)	(<0.001)	(<0.001)
Driving	-	0.072	−0.023	0.071	0.061	−0.029	0.153
		(0.002)	(0.32)	(0.002)	(0.008)	(0.208)	(<0.001)
Precise work	-	-	−0.045	0.030	−0.031	−0.079	0.205
			(0.047)	(0.194)	(0.182)	(0.001)	(<0.001)
Commuting	-	-	-	−0.164	−0.137	0.049	−0.070
				(<0.001)	(<0.001)	(0.031)	(0.002)
Before sleep	-	-	-	-	0.089	−0.206	0.043
					(<0.001)	(<0.001)	(0.042)
Sleep	-	-	-	-	-	−0.041	0.005
						(0.073)	(0.836)
Meeting	-	-	-	-	-	-	−0.058
							(0.012)