Tables
- TABLE 1
Distribution and outcomes of t-tests and Chi-squared tests
Parameters Fail Not fail p-value Chi-squared or Fisher's exact test OR (95% CI) Patients n 32 101 Patient parameters Age years 50±11 52±10 0.32 BMI kg·m−2 34±6.1 35±6.7 0.8 Females 7 (22) 8 (8) 0.04 3.2 (1–9.8) Clinical parameters ESS score 13±6 11±5 0.04 AHI events per h 34±24 27±19 0.15 ODI events per h 38±27 29±23 0.08 Driving parameters Duration for which licence held years 30±10 32±11 0.3 Annual distance driven >10 000 miles# 15 (50) 49 (54) 0.6 1.2 (0.5–2.7) Predominantly local journeys 17 (55) 55 (55) 0.85 0.92 (0.4–2) HGV/PSV drivers 1 (3) 11 (11) 0.18 0.26 (0.03–2.1) Driving questionnaire parameters Taking a break at <1 h during long journeys 7 (22) 2 (2) <0.001 13 (2.6–68) Likelihood of feeling slightly sleepy while driving 25 (80) 65 (65) 0.09 2.3 (0.86–6.1) Likelihood of feeling moderately sleepy while driving 19 (61) 40 (40) 0.033 2.4 (1.0–5.5) Likelihood of feeling highly sleepy while driving 12 (39) 16 (16) 0.006 3.3 (1.3–8.2) Nodded off while driving in the last year 14 (48) 24 (24) 0.014 2.9 (1.1–4.0) Hit the rumble strip on motorway 12 (40) 30 (32) 0.33 1.4 (0.6–3.2) Near misses in last 1 year 8 (27) 20 (20) 0.43 1.4 (0.56–3.7) Any accidents in last 3 years 11 (37) 22 (22) 0.09 2. 0 (0.86–5.0) Simulator parameter Study performed in the afternoon 16 (50) 45 (45) 0.59 0.8 (0.3–1.7) Data are presented as mean±sd or n (%), unless otherwise stated. BMI: body mass index; ESS: Epworth Sleepiness Scale; AHI: apnoea–hypopnoea index; ODI: oxygen desaturation index; HGV: heavy goods vehicle; PSV: public service vehicle. #: ∼16 000 km.
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