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. 2014 May 28;9(5):e97538. doi: 10.1371/journal.pone.0097538

Table 3. Effect estimates (95% CI) of hearing thresholds (dBHL) with IQR increment in occupational noise exposure (dBA).

Frequency	Model A^a			Model B^b			Model C^c			Model D^d
	Per noise IQR^e			Per noise IQR^e			Per noise IQR^e			Per noise IQR^e
	Estimate	(95% CI)		Estimate	(95% CI)		Estimate	(95% CI)		Estimate	(95% CI)
PTA^f	6.06	(5.73,	6.39)^*	2.33	(2.03,	2.62)^*	2.35	(2.05,	2.64)^*	2.24	(1.94,	2.54)^*
0.5 kHz	0.54	(0.32,	0.76)^*	−0.10	(−0.33,	0.12)	−0.12	(−0.35,	0.11)	−0.14	(−0.37,	0.09)
1 kHz	1.97	(1.73,	2.22)^*	0.62	(0.37,	0.87)^*	0.64	(0.39,	0.89)^*	0.64	(0.39,	0.89)^*
2 kHz	4.22	(3.92,	4.52)^*	1.72	(1.43,	2.01)^*	1.71	(1.43,	2.00)^*	1.65	(1.36,	1.95)^*
3 kHz	7.21	(6.82,	7.59)^*	2.97	(2.63,	3.32)^*	3.01	(2.66,	3.36)^*	2.88	(2.52,	3.23)^*
4 kHz	6.75	(6.34,	7.16)^*	2.29	(1.93,	2.65)^*	2.32	(1.96,	2.69)^*	2.19	(1.82,	2.56)^*
6 kHz	6.90	(6.45,	7.34)^*	2.67	(2.26,	3.07)^*	2.70	(2.29,	3.11)^*	2.54	(2.13,	2.95)^*

CI, confidence interval.

^aModel A was a crude model.

^bModel B was adjusted for age, age², sex.

^cModel C: Model B + further adjusted for BMI, hypertension.

^dModel D: Model C + further adjusted for occupational exposures to organic solvents and heavy metals.

^eHearing Thresholds (dBHL) change per interquartile range (IQR) of occupational noise, 94.26 dBA - 84.74 dBA: 9.52 dBA.

^fPTA (pure tone average at 2, 3, 4 kHz).

*p<0.05.