Table 6.

Model coefficients (Coeff.), 95% confidence intervals (CI) and probability values (p) of the linear mixed-effects model M_QDT for annoyance in experiment 2. The parameters and symbols are explained in Equation (6) of experiment 1 (but with τ_QTD with 3 levels).

Parameter	Symbol	Coeff.	95% CI of Coeff.	p
Intercept	μ	2.442	[1.378; 3.505]	<0.001
QTD	τ QTD, i=irreg (2 × 3-min)	0.546	[−0.113; 1.205]	=0.10
	τ QTD, i=irreg (6 × 1-min)	−0.079	[−0.732; 0.573]	=0.81
	τ QTD, i=regular	0 a
Playback No. (PN)	γ	0.603	[0.272; 0.934]	<0.001
Random effect variance	u 2 k	1.299	[0.863; 1.957]	<0.001
Residual variance (intercept)	ε 2 ik	2.761	[1.423; 5.356]	0.003

^a Reference.