Table 3.

Neighborhood socioeconomic status as effect modifier in the relationships between static road noise exposure at census tract level and insulin resistance and type 2 diabetes mellitus (N = 573).

Insulin resistance		n	β	(95%CI)
Static road noise exposure at census tract level	Neighborhood SES
<53 dB(A)	≥ median income	152	Ref.
≥53 dB(A)	≥ median income	137	− 0.08	(−0.27, 0.11)
<53 dB(A)	< median income	128	0.01	(−0.18, 0.19)
≥53 dB(A)	< median income	156	0.15	(−0.04, 0.34)
Diabetes			OR	(95%CI)
Static road noise exposure at census tract level	Neighborhood SES
<53 dB(A)	≥ median income	152	Ref.
≥53 dB(A)	≥ median income	137	0.48	(0.17, 1.39)
<53 dB(A)	< median income	128	1.01	(0.42, 2.44)
≥53 dB(A)	< median income	156	2.34	(1.12, 4.90)
Measure of interaction on additive scale
RERI			1.85	(0.32, 3.37)

Models adjusted for sex, age, ethnicity, individual income, and NO2. SES: socioeconomic status; RERI: relative excess risk due to interaction.