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Breathing Disruption Index (BDI)

The BDI indicates how often per hour on average you stopped breathing or struggled to breathe in the night. In a clinical study BDI events matched apnoea and hypopnea events used to assess OSA in 80% of cases. We calculate BDI by dividing the number of events by the number of hours of recording time. Anything less than 5 events per hour is reported as “<5. Anything over 60 events per hour is reported as “>60” – this is the maximum figure the BDI can give. . With 5 or more events an hour you may have sleep apnoea and you should see your doctor for an assessment. It also indicates that you might benefit from a treatment or intervention If you have less than 5 events an hour you should still see your doctor if you also have daytime symptoms such as tiredness or headaches. Less than 5 events per hour coupled with significant snoring suggests you might benefit from a treatment or intervention but unless you also have daytime symptoms your doctor may not consider it appropriate for you to undertake a sleep study.