Table 2.

Association of OD with concomitant diseases.

Diseases of the upper gastrointestinal tract	OR = 0.8 (95% CI 0.43–1.67), p = 0.63
COPD	OR = 1.1 (95% CI 0.45–2.70), p = 0.83
Diabetes mellitus type 1 and 2	OR = 1.2 (95% CI 0.62–2.19), p = 0.65
CNS diseases	OR = 7.4 (95% CI 3.75–14.81), p < 0.001