Table 3 Multilevel models parameter estimates for ambient noise level L_Aeq

Fixed Part

Intercept

58.93

56.83

56.8

 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]

 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]

 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]

 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]

 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