| 1 | A | B | C | D | E | F |
| --- | --- | --- | --- | --- | --- | --- |
| 2 | mean age at symptom onset and at diagnosis of multiple sclerosis, by age group at symptom onset, household population aged 15 or older with multiple sclerosis, canada excluding territories, 2011 |  |  |  |  |  |
| 3 |  | age group at symptom onset |  |  |  |  |
| 4 |  | 15 to 19 | 20 to 29 | 30 to 39 | 40 to 49 | 50 or older |
| 5 | mean age at symptom onset | 15.6 | 24.7 | 34.2 | 43.3 | 56.0 |
| 6 | mean age at diagnosis | 26.0 | 28.9 | 38.7 | 45.9 | 58.0 |
| 7 | mean years between symptom onset and diagnosis | 10.5 | 4.3 | 4.5 | 2.6 | 2.0 |

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?
Answer: 15 to 19

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?
Answer: 40 to 49