Table 3.

Estimated effect in dB on hearing over 10 years, and 10 dB (L_EQ) increase in exposure^*

Variable	HTL		DPOAE at 40 dB
	Phases 1 and 2	Phase 2 only	Phases 1 and 2	Phase 2 only
3 kHz HTL (effect (SE))	2.24 (0.746)	2.16 (1.16)	−0.92 (0.611)	−0.408 (0.812)
p Value	0.003	0.062	0.133	>0.2
95% CI	0.777 to 3.70	−0.105 to 4.42	−2.12 to 0.279	−2.00 to 1.19
4 kHz HTL (effect (SE))	2.33 (0.77)	3.38 (1.32)	−1.11 (0.64)	−1.96 (0.880)
p Value	0.003	0.011	0.083	0.026
95% CI	0.813 to 3.85	0.784 to 5.97	−2.36 to 0.045	−3.68 to −0.232
6 kHz HTL (effect (SE))	1.60 (0.958)	2.91 (1.36)	−1.30 (0.721)	−1.01 (0.985)
p Value	0.094	0.033	0.072	>0.2
95% CI	−0.275 to 3.48	0.242 to 5.57	−2.71 to 0.116	−2.94 to 0.921
4 kHz (effect (SE))
Exposure with low peakiness†	1.17 (0.885)	3.64 (1.47)	−1.43 (0.787)	−1.03 (1.02)
95% CI	−0.565 to 2.91	0.766 to 6.52	−2.98 to 0.105	−3.03 to 0.956
Exposure with high peakiness†	2.40 (0.772)	3.38 (1.33)	−1.07 (0.646)	−2.13 (0.873)
95% CI	0.886 to 3.91	0.774 to 5.98	−2.34 to 0.194	−3.84 to −0.41

^*Models controlled for time since baseline, age, gender and baseline hearing threshold, and phase, where appropriate.

^†Additional effect of noise exposure with high peakiness, interaction term.