Participants continued to play the didgeridoo even after the study!
Playing the didgeridoo was life-changing for the participants. Not only did their apnea-hypopnea indexes drop, but they enthusiastically continued playing the instrument. Most players used their instruments at least 20 minutes a day for six days a week rather than the five prescribed initially.
The unattended result: there are now 14 more enthusiastic didgeridoo players in the world. And, these participants have contained their sleep apnea without undergoing surgery or using CPAP machines.