Table 4

Severity grading and probability of a result being found within a normal healthy population for various z-score thresholds

Threshold for z-scoreSeverity gradingApproximate chance of finding this result in a healthy population
<−1.645Mild1 in 20
<−2Moderate1 in 40
<−2.5Moderately severe1 in 150
<−3Severe1 in 750
<−4Very severe1 in 30 000
  • Adapted from Quanjer et al.51