Table 3.

Odds ratios (95% CI) in logistic regression for the association of total leisure noise exposure and hearing threshold shift at extended high frequencies

Frequency (kHz)	Total leisure noise (dB(A))	N (%)	Bivariate modela	Multivariate model 1b	Multivariate model 2c
9	<85	74 (26.6)	1.00	1.00	1.00
	85 to <90	109 (39.2)	0.71 (0.30–1.70)	0.68 (0.28–1.65)	0.71 (0.29–1.73)
	≥90	95 (34.2)	1.25 (0.55–2.86)	1.20 (0.52–2.77)	1.26 (0.54–2.93)
10	<85	74 (26.6)	1.00	1.00	1.00
	85 to <90	109 (39.2)	0.81 (0.32–2.07)	0.82 (0.32–2.13)	0.90 (0.34–2.36)
	≥90	95 (34.2)	0.95 (0.37–2.42)	0.93 (0.36–2.40)	1.02 (0.39–2.67)
11.2	<85	74 (26.6)	1.00	1.00	1.00
	85 to <90	109 (39.2)	0.73 (0.28–1.89)	0.78 (0.30–2.07)	0.82 (0.31–2.19)
	≥90	95 (34.2)	1.04 (0.42–2.63)	1.07 (0.42–2.72)	1.12 (0.44–2.89)
12.5	<85	74 (26.6)	1.00	1.00	1.00
	85 to <90	109 (39.2)	0.93 (0.35–2.43)	0.95 (0.36–2.53)	0.98 (0.37–2.64)
	≥90	95 (34.2)	1.08 (0.41–2.84)	1.09 (0.41–2.90)	1.13 (0.42–3.03)
14	<85	74 (26.6)	1.00	1.00	1.00
	85 to <90	109 (39.2)	0.72 (0.34–1.52)	0.70 (0.33–1.50)	0.74 (0.34–1.59)
	≥90	95 (34.2)	0.73 (0.34–1.59)	0.71 (0.33–1.55)	0.75 (0.34–1.65)
16	<85	74 (26.6)	1.00	1.00	1.00
	85 to <90	109 (39.2)	0.93 (0.48–1.82)	0.95 (0.48–1.87)	1.00 (0.50–1.98)
	≥90	95 (34.2)	0.91 (0.46–1.82)	0.91 (0.45–1.82)	0.96 (0.48–1.95)

^aNo covariate in bivariate model, only total leisure noise exposure. ^bAdjusted for sex and school type. ^cAdjusted for sex, school type and firecracker exposure.