Table 4.

Average rates of change to audiometric thresholds and PTA (dB) per year

		95% CI
	B	LL	UL
Frequency (Hz)
250	0.42	0.38	0.45
500	0.56	0.52	0.60
1000	0.75	0.70	0.80
2000	0.98	0.93	1.03
3000	0.97	0.92	1.02
4000	0.98	0.93	1.03
6000	1.14	1.08	1.20
8000	1.44	1.38	1.50
PTA	0.83	0.79	0.86

B Beta coefficient; CI Confidence Interval, LL Lower limit, UL Upper limit, PTA pure-tone average, calculated from frequencies 500, 1000, 2000 and 4000 Hz averaged across right and left ears, dB decibels.