TABLE 2.

SUMMARY OF IMPAIRMENT OUTCOMES

	n	Median (IQR)*	Percentiles (5th, 95th)
Epworth Sleepiness Scale, total score	386	8.0 (6.0, 12.0)	2.0, 17.0
Multiple Sleep Latency Test, min	406	7.5 (4.9, 11.1)	2.1, 15.2
Psychomotor Vigilance Task, lapses/trial	402	1.8 (0.8, 3.6)	0.0, 6.2
Divided Attention Driving Task, mean tracking error	379	213.5 (164.3, 292.0)	102.2, 528.2
	n	Percent†	95% CI‡
Psychomotor Vigilance Task, lapses/trial
> 3 lapses	111	29.2	25.1, 33.4
⩽ 3 lapses	291	70.8	66.6, 74.9
Divided Attention Driving Task, mean tracking error
> 250 cm	142	36.9	32.5, 41.4
⩽ 250 cm	237	63.1	58.6, 67.5
Multiple Sleep Latency Test
< 5 min	111	25.7	21.9, 29.4
⩾ 5 min	295	74.3	70.6, 78.1
Number of impairments
3	22	5.3	3.3, 7.3
2	80	19.6	16.1, 23.2
1	138	34.6	30.3, 38.9
0	166	40.5	36.1, 44.9

Definition of abbreviations: n = number of subjects with complete data for specified outcome.

All estimates are adjusted for stratified sampling by risk group.

^*The IQR is defined as the difference between the 25th and 75th percentile values.

^†(25th percentile, 75th percentile). The weighted percentage is computed as (0.415 × higher risk [%]) + (0.585 × lower risk [%]).

^‡Lower and upper bounds, respectively, of 95% confidence intervals for percent values, accounting for stratified sampling.