question: for people whose symptoms began at age 40 or later and those whose symptoms appeared at ages 30 to 39,which group of people have shorter gap between symptom onset and diagnosis?
table.cells: age group at symptom onset
table.cells: 15 to 19 20 to 29 30 to 39 40 to 49 50 or older
table.cells: mean age at symptom onset 15.6 24.7 34.2 43.3 56.0
table.cells: mean age at diagnosis 26.0 28.9 38.7 45.9 58.0
table.cells: mean years between symptom onset and diagnosis 10.5 4.3 4.5 2.6 2.0