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Table 2 Jet fuel exposure group means for the audiometric hearing thresholds at each tested frequency for the right and left ears and for the average across standard audiometric frequencies (1–8 kHz) and ultra-high frequencies (10 and 12 kHz) for the better ear a,b

From: Jet fuel exposure and auditory outcomes in Australian air force personnel

Frequency Low exposure (95% CI) Moderate exposure (95% CI) High exposure (95% CI) p-value c
1 kHz
 Right ear 5.51 (1.84–9.19) 7.00 (2.61–11.40) 4.40 (1.89–6.91) 0.521
 Left ear 4.40 (0.36–8.43) 4.10 (−0.18–8.37) 5.60 (2.06–9.14) 0.830
2 kHz
 Right ear 2.22 (−1.49–5.93) 6.48 (1.42–11.55) 7.20 (2.78–11.61) 0.295
 Left ear 4.91 (1.34–8.50) 8.52 (3.94–13.10) 6.40 (3.17–9.64) 0.525
3 kHz
 Right ear 3.80 (−0.20–7.81) 8.34 (0.72–15.96) 11.73 (7.15–16.30) 0.062
 Left ear 6.39 (1.60–11.19) 11.73 (5.37–18.08) 14.96 (9.24–20.68) 0.104
4 kHz
 Right ear 5.85 (1.44–10.25) 15.80 (8.41–23.20) 16.99 (11.05–22.92) 0.017
 Left ear 7.88 (2.92–12.85) 24.04 (13.66–34.42) 19.27 (12.82–25.72) 0.007
6 kHz
 Right ear 11.07 (5.30–16.84) 19.92 (11.29–28.55) 16.54 (10.84–22.25) 0.228
 Left ear 10.60 (4.97–16.23) 23.29 (12.09–34.50) 21.45 (13.90–29.01) 0.061
8 kHz
 Right ear 6.98 (1.86–12.10) 20.59 (9.81–31.36) 15.65 (9.35–21.95) 0.041
 Left ear 9.68 (3.13–16.23) 21.59 (12.16–31.03) 20.91 (13.46–28.36) 0.060
10 kHz
 Right ear 14.18 (6.71–21.66) 28.33 (18.69–37.97) 21.45 (14.67–28.23) 0.085
 Left ear 13.18 (5.15–21.20) 27.92 (18.27–37.58) 25.37 (18.32–23.43) 0.038
12 kHz
 Right ear 24.94 (17.29–32.60) 33.58 (25.44–41.72) 32.39 (24.14–40.63) 0.328
 Left ear 24.84 (15.43–34.25) 32.91 (24.26–41.57) 36.01 (27.37–44.64) 0.268
Better ear 1–8 kHz 4.70 (1.39–8.01) 12.10 (6.35–17.80) 11.57 (7.49–15.65) 0.037
Better ear 10–12 kHz 15.93 (8.48–23.39) 28.97 (20.17–37.78) 25.25 (18.49–32.02) 0.085
  1. aMeans estimated through a multivariate linear regression using bootstrapping for calculating the standard error (10,000 replications)
  2. bMeans adjusted by age and noise exposure levels
  3. cp-value estimated through a Wald test
  4. CI: Confidence interval