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

5.51 (1.84–9.19)

7.00 (2.61–11.40)

4.40 (1.89–6.91)

0.521

4.40 (0.36–8.43)

4.10 (−0.18–8.37)

5.60 (2.06–9.14)

0.830

2.22 (−1.49–5.93)

6.48 (1.42–11.55)

7.20 (2.78–11.61)

0.295

4.91 (1.34–8.50)

8.52 (3.94–13.10)

6.40 (3.17–9.64)

0.525

3.80 (−0.20–7.81)

8.34 (0.72–15.96)

11.73 (7.15–16.30)

0.062

6.39 (1.60–11.19)

11.73 (5.37–18.08)

14.96 (9.24–20.68)

0.104

5.85 (1.44–10.25)

15.80 (8.41–23.20)

16.99 (11.05–22.92)

0.017

7.88 (2.92–12.85)

24.04 (13.66–34.42)

19.27 (12.82–25.72)

0.007

11.07 (5.30–16.84)

19.92 (11.29–28.55)

16.54 (10.84–22.25)

0.228

10.60 (4.97–16.23)

23.29 (12.09–34.50)

21.45 (13.90–29.01)

0.061

6.98 (1.86–12.10)

20.59 (9.81–31.36)

15.65 (9.35–21.95)

0.041

9.68 (3.13–16.23)

21.59 (12.16–31.03)

20.91 (13.46–28.36)

0.060

14.18 (6.71–21.66)

28.33 (18.69–37.97)

21.45 (14.67–28.23)

0.085

13.18 (5.15–21.20)

27.92 (18.27–37.58)

25.37 (18.32–23.43)

0.038

24.94 (17.29–32.60)

33.58 (25.44–41.72)

32.39 (24.14–40.63)

0.328

24.84 (15.43–34.25)

32.91 (24.26–41.57)

36.01 (27.37–44.64)

0.268

4.70 (1.39–8.01)

12.10 (6.35–17.80)

11.57 (7.49–15.65)

0.037

15.93 (8.48–23.39)

28.97 (20.17–37.78)

25.25 (18.49–32.02)

0.085