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. Author manuscript; available in PMC: 2013 Aug 1.

Published in final edited form as: J Occup Environ Med. 2012 Aug;54(8):1017–1025. doi: 10.1097/JOM.0b013e3182572e16

Table 4.

Comparison between high and low risk drivers that were tested with PSG versus the ones that were not yet tested with PSG.

Parameters	High-risk Drivers (Class 1) n=5908			Low-risk drivers (non-class 1) n= 13,463
Parameters	Tested with PSG n=2103	Not yet tested with PSG n=3805	p-value	Tested with PSG n=326	Not yet tested with PSG n=13,137	p-value
Gender (% male)	2014 (96)	3714 (98)	N/A	271 (88.1)	11,883 (90.45)	N/A
Age mean [±SD]	45.3 [10] 2080	43.0 [10.9] 3754	<0.001	41.8 [11.2] n=324	40.1 [11.0] n=12,960	0.002
BMI mean [±SD]	36.3 [6.7] 2097	36.4 [6.2] 3799	0.0669	31.7 [7.1] n= 324	28.4 [5.2] n=13,085	0.001
Neck size mean [±SD]	17.9 [1.6] 1502	18.1 [1.6] 3061	<0.001	16.7 [1.3] n= 155	16.4 [1.2] n= 8213	<0.001
EDS n (%)^*	485 (23)	512 (13)	<0.001	110 (33.7)	705 (5.4)	<0.001
Witnessed apneas n (%)^*	523 (25)	654 (17)	<0.001	0	0	N/A
Hypertension n (%)^*	936 (45)	1563 (41)	0.011	51 (15.6)	989 (7.5)	<0.001
Diabetes n (%)^*	399 (19)	624 (16)	0.013	18 (5.5)	260 (2.0)	<0.001
Heart Disease n (%)^*	115 (5)	168 (4)	0.075	9 (2.8)	123 (0.9)	0.005
GERD n (%)^*	309 (15)	537 (14)	0.561	44 (13.5)	854 (6.5)	<0.001

BMI= body mass index; EDS= excessive daytime sleepiness; GERD= gastroesophageal reflux disease; N/A= not applicable; PSG= Polysomnogram

^*

Number and % of participants that answered, “yes” on the SomniSage® questionnaire