Motor vehicle accidents and obstructive sleep apnea syndrome: A methodology to calculate the related burden of injuries

The association between motor vehicle accidents (MVAs) and obstructive sleep apnea syndrome (OSAS) has always been quantified as risk of MVAs for individual drivers with OSAS. We evaluated the expected injured patients per year attributable to OSAS-dependent MVAs in a general population. By combining OSAS prevalence and OSAS-dependent MVAs odds ratio, we assessed the population attributable fraction (PAF), an epidemiological tool that can be used to quantify the proportion of road traffic injuries (RTIs) attributable to OSAS. For an apnea hypopnea index >5, the weighed median and combined average of OSAS prevalence were 4.4 (95% confidence interval (CI): 3.7-7.5) and 4.7 (95% CI: 4.2-5.2), respectively; values of risk of OSAS-dependent MVAs were 2.83 (95% CI: 2.72-3.08) and 2.52 (95% CI: 2.07-3.08), respectively. The PAF showed weighed median and combined average values of 6.6 (95% CI: 4.3-9.8) and 7.3% (95% CI: 6.0-13.5), respectively. Our results show that about 7% of RTIs for a population of male drivers involved in MVAs are attributable to OSAS. This value can be used to assess the potential impact, on the reduction of incidence of the motor vehicle injuries, of prevention programs aimed at reducing the number of subjects with an undiagnosed and/or untreated OSAS.