Table 3.

Multilevel models parameter estimates for ambient noise level L_Aeq

	Model 1			Model 2			Model 3
	β	95%CI	P	β	95%CI	P	β	95%CI	P
Fixed Part
Intercept	58.93			56.83			56.8
Intervention effect
Phase 1 (without visual signal)	Ref		< 10−3	Ref		< 10−3			< 10−3
Phase 2 (with visual signal)	−4.28	[−5.04; − 3.52]		−4.19	[−4.63; − 3.74]		− 4.19	[− 4.63; − 3.75]
Period
Night (09:00 PM – 07:00 AM)				Ref		< 10− 3	Ref		< 10− 3
Day (07:00 AM – 09:00 PM)				1.51	[1.17; 1.85]		1.53	[1.19; 1.87]
Number of calls per minute
0				Ref		0.74			0.97
1–2				−0.03	[−0.22; 0.17]		0.03	[−0.25; 0.31]
≥ 3				0.06	[−0.2; 0.31]		0,00	[−0.58; 0.58]
Number EMDC workers
8–9				Ref		< 10−3			< 10− 3
10–17				1.41	[0.88; 1.94]		1.36	[0.77; 1.95]
18–20				1.72	[0.79; 2.64]		2.76	[1.6; 3.92]
Tnteraction between the number of calls per minute and the number of EMDC workers							Ref
0 call per minute									0.04
1–2 calls per minute / 10–17 workers							−0.01	[−0.41; 0.39]
≥ 3 calls per minute / 10–17 workers							0.24	[−0.43; 0.90]
1–2 calls per minute / 18–20 workers							−1.1	[−1.97; −0.22]
≥ 3 calls per minute / 18–20 workers							−1.16	[−2.16; −0.16]
Random Part
Level2: Time block	1.58			0.39			0.38
Level1: Minute	13.93			13.88			13.87
−2*loglikelihood:	47,398.11			47,308.62			47,298.37
Units: Time block	46			46			46
Units: Minute	8640			8640			8640

CI Confidence Interval