Table 3—

Best cut-off points of cardiorespiratory polygraphic scores in sleep apnoea/hypopnoea syndrome (SAS) for different polysomnographic diagnostic criteria

SAS diagnosisCut-off pointSensitivity %Specificity %
AHI ≥5
 Automatic scores0.482.3 (73–91)63.6 (35–92)
 Manual scores6.797.1 (93–100)90.9 (74–100)
AHI ≥10
 Automatic scores2.262.5 (51–74)86.7 (69–100)
 Manual scores9.890.6 (83–98)86.7 (69–100)
AHI ≥15
 Automatic scores2.364.1 (51–47)73.1 (56–90)
 Manual scores15.890.6 (83–98)80.8 (66–96)
AHI ≥20
 Automatic scores2.360.0 (46–74)58.8 (42–75)
 Manual scores21.191.1 (83–99)85.3 (73–79)
AHI ≥30
 Automatic scores2.362.9 (47–79)56.9 (42–71)
 Manual scores27.688.6 (78–99)90.9 (82–99)
  • Data as mean with 95% confidence intervals