. 2018 Jun 13;15(6):1256. doi: 10.3390/ijerph15061256

Table 1.

Design for environmental scenarios in 3 × 4 × 3 full factorial experiment. ^a

	T₁			T₂			T₃
	I₁	I₂	I₃	I₁	I₂	I₃	I₁	I₂	I₃
N₁	T₁N₁I₁	T₁N₁I₂	T₁N₁I₃	T₂N₁I₁	T₂N₁I₂	T₂N₁I₃	T₃N₁I₁	T₃N₁I₂	T₃N₁I₃
N₂	T₁N₂I₁	T₁N₂I₂	T₁N₂I₃	T₂N₂I₁	T₂N₂I₂	T₂N₂I₃	T₃N₂I₁	T₃N₂I₂	T₃N₂I₃
N₃	T₁N₃I₁	T₁N₃I₂	T₁N₁I₃	T₂N₃I₁	T₂N₃I₂	T₂N₃I₃	T₃N₃I₁	T₃N₃I₂	T₃N₃I₃
N₄	T₁N₄I₁	T₁N₄I₂	T₁N₄I₃	T₂N₄I₁	T₂N₄I₂	T₂N₄I₃	T₃N₄I₁	T₃N₄I₂	T₃N₄I₃

^a T_i—temperature levels, in which, T₁ represents 17 °C, T₂ represents 22 °C, and T₃ represents 27 °C. N_i—noise levels, in which N₁ represents 40 dB(A), N₂ represents 50 dB(A), N₃ represents 60 dB(A), and N₄ represents 70 dB(A). I_i—illuminance levels, in which, I₁ represents 60 lx, I₂ represents 300 lx, and I₃ represents 2200 lx.