Table 3. Table showing the number (%) of patients by the observation time between the first and last visit.

Time in years	Number of patients (%) N  = 217,887
No follow-up	32,922	(15.1)
Up to 5 y	91,289	(41.9)
>5 and ≤10 y	48,195	(22.1)
>10 and ≤15 y	31,078	(14.3)
>15 and ≤20 y	11,989	(5.5)
>20 y	2,414	(1.1)