Table 3.

Associations between mean 1- and 5-y exposure to residential indoor low-frequency wind turbine noise and redemption of prescriptions for sleep medication and antidepressants.

Indoor low-frequency wind turbine noise	Sleep medication			Antidepressants
	Cases (n)	Crude HR (95% CI)a	Adjusted HR (95% CI)b	Cases (n)	Crude HR (95% CI)a	Adjusted HR (95% CI)b
1-year mean exposure (dB)
$<5$	64,617	1 (Ref)	1 (Ref)	77,360	1 (Ref)	1 (Ref)
$5–10$	3,299	0.94 (0.91, 0.98)	1.03 (0.99, 1.06)	4,073	0.93 (0.91, 0.96)	1.01 (0.98, 1.04)
$10–15$	726	0.96 (0.89, 1.03)	1.08 (1.00, 1.16)	882	0.92 (0.86, 0.98)	1.03 (0.97, 1.10)
$\ge 15$	54	0.93 (0.71, 1.22)	1.05 (0.81, 1.38)	58	0.82 (0.63, 1.06)	0.96 (0.74, 1.24)
5-y mean exposure (dB)
$<5$	65,202	1 (Ref)	1 (Ref)	77,995	1 (Ref)	1 (Ref)
$5–10$	2,911	0.97 (0.93, 1.01)	1.05 (1.01, 1.09)	3,663	0.96 (0.93, 1.00)	1.04 (1.00, 1.07)
$10–15$	542	0.93 (0.86, 1.02)	1.04 (0.96, 1.14)	672	0.90 (0.84, 0.97)	1.01 (0.94, 1.10)
$\ge 15$	41	0.92 (0.68, 1.25)	1.03 (0.76, 1.40)	43	0.80 (0.59, 1.07)	0.94 (0.70, 1.27)

Note: CI, confidence interval; HR, hazard ratio; Ref, reference.

^aAdjusted for age, sex, and calendar-year.

^bAdjusted for age, sex, calendar-year, personal income, education, marital status, work-market affiliation, area-level socioeconomic status, type of dwelling, traffic load in a $500\text{-}\mathrm{m}$ radius, and distance to nearest major road.