Table 6.

Correlation analysis between productivity and cognitive state, and thermal comfort.

Intermediary factor	Measuring indicator		Productivity
			Accuracy	Reaction time
Cognitive state	Attention	(SMR + Middle β)/θ	0.073	−0.379***
	Mental workload	AF3	0.05	−0.403***
		AF4	−0.033	−0.405***
		T7	0.074	−0.384***
		T8	0.05	−0.363***
	Vigilance	θ/β	−0.044	0.421***
		(θ + β)/(α + γ)	−0.105	0.174
		α/(β + γ)	0.026	0.252*
	Mental fatigue	θ/α	−0.094	0.251*
		θ/β	−0.044	0.421***
		(θ + α)/β	−0.027	0.414***
		α/β	0.025	0.234*
		(θ + α)/(α + β)	−0.063	0.397***
Thermal comfort	Thermal sensation		−0.045	0.451***
	Comfort		0.199	−0.094

*: P < 0.05, **: P < 0.01, ***: P < 0.001.