In addition to ODI, other variable such as heart rate variability (HRV) for quantizing sympathetic tone was also suggested as a useful parameter in the evaluation of OSA. Future work will test this parameter to verify if it is a valuable parameter. It will be accompanied with ODI for constructing a predictive model for OSA diagnosis if it has been verified as an effective parameter.
In previous section, we have demonstrated that the variables, such as age, ODI, and AHI, obtained from subjects without enough sleeping time is significantly different from those whose sleeping time is more than 4 hours. The former group tends to be more severe than the latter group.
More PSG tests are needed to confirm if the test with sleeping less than 4 hours is valid for OSA diagnosis.
Based on the cost-benefit analysis, we suggest that home-styled oximetry alone can be used for sifting severe patients which will be followed by PSG to discriminate normal, mild, and moderate subjects with a total cost down of 35.72%. More large scale experiment and rigorous analysis are needed to see the proportion of normal subjects will be incorrectly diagnosed as severe.
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