Obstructive Sleep Apnea, Excessive Daytime Sleepiness, and Road Traffic Accidents among Interstate Commercial Vehicle Drivers in Nigeria

Table 3

Bivariate analysis of obstructive sleep apnea and excessive daytime sleepiness.

		Epworth Sleepiness Scale					Obstructive sleep apnea
Variables	Total respondents	ESS score > 11		ESS score ≤ 11		value	Low risk		High risk		value
			%		%			%		%
Age group
20–29	13	5	38.5	8	61.5	0.293	8	61.5	5	38.5	0.720
30–39	38	9	23.7	29	76.3		26	68.4	12	31.6
40–49	48	7	14.5	41	85.4		28	58.3	20	41.7
50 and above	17	4	23.5	13	76.5		12	70.6	5	29.4
BMI (kg/m^2)
Less than or equal to 24	26	5	19.2	21	80.8		21	80.8	5	19.2
25–29	50	9	18.0	41	82.0	0.481	45	90.0	5	10.0	0.000
30 and above	47	13	27.7	34	72.3		15	31.9	32	68.1
Waist circumference
Below or equal to 94 cm	70	15	21.4	55	78.6	0.915	56	80.0	14	20.0	0.000
Above 94 cm	54	12	22.2	42	77.8		26	48.2	28	51.8
Waist-hip ratio
Below or equal to 0.95	83	14	16.9	69	83.1	0.046	52	62.6	31	37.4	0.476
Above 0.95	36	12	33.3	24	66.7		25	69.4	11	30.6
Snoring
Nonsnorer	61	8	13.1	53	86.9		58	95.1	3	4.9
Simple snorer	25	3	12.0	22	88.0	0.001	13	52.0	12	48.0	0.000
Habitual snorer	38	16	42.1	22	57.9		11	28.9	27	71.1
Self-reported Diagnosis of hypertension
Yes	23	9	39.1	14	60.9	0.025	5	21.7	18	78.3	0.000
No	101	18	17.8	83	82.2		77	76.2	24	23.8
Witnessed apnea
2 times/week or less	110	22	20.0	88	80.0	0.030	73	66.4	37	33.6	0.299
3 times/week or more	10	5	50.0	5	50.0		5	50.0	5	50.0

OSA: obstructive sleep apnea and ESS: Epworth Sleepiness Scale.