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52
EFFECTS ON SLEEP
Table 3.1.
Coefficients of the quadratic equation (formula [6]) of m and k as a function
of L Amax,inside or SEL inside for the 15-second interval in which an indoor maximum
sound level of an aircraft noise event occurs. The equations are applicable
in the L Amax,inside range from a up to 70 dB(A), or SEL inside range from a up
to 80 dB(A). Below a, m and k are zero.
(Aircraft) noise-induced increase
ofprobability ofmotility (m)
(Aircraft) noise-induced
increase ofprobability of
onset ofmotility (k)
range 32 < L Amax,inside < 70 dB(A) 32 < L Amax,inside < 70 dB(A)
(see Fig. 3.2)
a 32 32
b 0.000633 0.000415
c 3.14x10 -5 8.84x10 -6
range 38 < SEL inside < 80 dB(A) 40 < SEL inside < 80 dB(A)
a 38 40
b 0,000532 0.000273
c 2.68x10 -5 3.57x10 -6
0.08
0.07
Fig. 3.2
Probability of (aircraft)
noise-induced
motility (m) at the 15-
second interval in
which the indoor
maximum sound level
occurs (solid line) and
the 95% confidence
interval, as a function
of L Amax,inside bedroom
Motility
0.06
0.05
0.04
0.03
0.02
0.01
Source: Miedema,
Passchier-Vermeer and Vos,
2003.
0
30 35 40 45 50 55 60 65 70
Lmax,Inside
The study report also gives the upper boundaries for motility, based on the relationship
between L Amax , SEL and L night (Fig. 3.3). This figure is mathematically derived
from relation [6] as described in Appendix 2.
This area of study is still under development. Miedema, Passchier-Vermeer and Vos
(2003) give a detailed account in their study report of the relation between the study
used for the data presented here (Passchier-Vermeer et al., 2002), earlier studies like
the much quoted Civil Aviation Authority study (Ollerhead et al., 1992; Ollerhead,
1994) and earlier work done in the United States.
NIGHT NOISE GUIDELINES FOR EUROPE