Table 3—

Evaluation of in-laboratory flow respiratory disturbance index (flow-RDI) in subgroups

AllFemaleBMI <25 kg·m−2AHI <15 events·h−1
Subjects n100203634
AHI31.2 (10.3–54.9)12.0 (7.5–22.3)15.3 (6.6–33.2)8.1 (4.3–10.9)
Correlation between AHI and flow-RDI r0.940.900.930.68
Difference between AHI and flow-RDI-9.5±10.7-5.7±10.2-5.1±8.0-0.4±3.3
Diagnostic ability of flow-RDI
 AHI >5 events·h−1
  Sensitivity0.960.880.970.83
  Specificity0.820.670.710.82
  AUC0.950.880.940.81
 AHI >15 events·h−1
  Sensitivity0.910.750.78NA
  Specificity0.820.830.89NA
  AUC0.960.890.92NA
 AHI >30 events·h−1
  Sensitivity0.891.000.91NA
  Specificity0.960.940.92NA
  AUC0.981.000.97NA
  • Data are presented as n, mean±sd or median (interquartile range), unless otherwise stated. BMI: body mass index; AHI: apnoea/hypopnoea index (median and interquartile range); r: Pearson's correlation coefficient; AUC: area under the receiver-operating characteristic curve; NA: not available.