Table 3. Derivation sample. Univariate logistic regression for the primary variable 'therapeutic decision'. Selection of variables for the final model.

Variable	OR	95% CI	P value
Male	3.15	1.74 to 5.99	<0.001
Age 18–45; 46–59; 60–70 (1)	2.56	1.37 to 4.95	0.002
Age 18–45; 46–59; 60–70 (2)	3.15	1.52 to 6.68	0.002
BMI <30; ≥30	3.61	2.11 to 6.24	<0.001
Frequent snoring	0.66	0.11 to 5.07	0.656
Breathing pauses	1.92	1.14 to 3.23	0.013
Daytime hypersomnia	1.06	0.63 to 1.77	0.835
History of accidents	0.31	0.02 to 1.81	0.220
Morning tiredness	0.62	0.36 to 1.04	0.071
Waking with sensation of asphyxia	1.02	0.54 to 1.89	0.948
Neck circumference ≤38; 38.1–42; >42 (1)	2.04	1.07 to 3.99	<0.001
Neck circumference ≤38; 38.1–42; >42 (2)	7.20	3.57 to 15.08	<0.001
AHT	4.00	2.26 to 7.17	<0.001
DM	3.36	1.04 to 11.64	0.043
Smoking status (1)	1.08	0.56 to 2.09	0.122
Smoking status (2)	1.80	0.99 to 3.32	0.122
Alcohol status	1.07	0.62 to 1.81	0.816
Epworth score <9; ≥9	1.67	0.99 to 2.86	0.056

AHT = arterial hypertension. BMI = body mass index. CI = confidence intervals. DM = diabetes mellitus. OR = odds ratio.