question: for people whose symptoms began before age 20 and those whose symptoms appeared at ages 30 to 39,which group of people have longer 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