≤20, 20<age≤30 30<age≤40 40<age≤46 46<age≤60 Age>60 Mean age 18.68 24.36 35.53 43.76 55.55 70.05 Empirical probability of problems 0.0417 0.054 0.060 0.066 0.114 0.107

Table 4: Empiric Probability of ventilatory problems with increasing age. Cut off 46 years.