“…First, the oximetry ODI was not measured simultaneously with PSG/OCST. Comparisons of ODI and AHI/REI from the same recordings showed the best correlation [ 14 , 15 , 16 , 17 , 18 , 19 ] ( Figure 5 ), followed by simultaneous recording by different devices [ 20 , 21 , 25 ]. The correlation was worst when comparing ODI and AHI/REI from different devices on different nights [ 23 , 24 ] ( Figure 2 a and Figure 6 ).…”