JSCM.Figure2

Table 2. Correlates of drowsy driving and witnessed apnea

Question	Significance (i.e. p-value)*
	Drowsy Driving	Witnessed Apneas•
Overall Berin Score	< 0.0001	< 0.0001
Do you snore?	< 0.01	< 0.001°
How loud is your snoring?	< 0.0001	< 0.0001
Does your snoring bother other people?	< 0.01	< 0.01
How often do you snore?	< 0.0001	< 0.0001
How often has someone noticed that you quit breathing during your sleep?	< 0.0001	n/a†
How often do you feel tired or fatigued after your sleep?	< 0.0001	< 0.0001
During your waking time, how often do you feel fatigued, or not up to par?	< 0.0001	< 0.0001	†This value has been omitted since the test described here would be correlating the variable with itself. °Respondents who answered "yes" had the stated p-value, respondents who answered "I don't know" were weakly correlated with p=0.10478 The significance value is taken from a univariate logistic regression model with the questions as univariate independent variables and the two responses as the dependent variables. •This variable was transformed such that "Nearly every day" and "3-4 times/week" were a positive response and every other response was a negative response.