Question

Study Subject	First Seen at Health Care for the Homeless	Vital Status at End of Follow-up 12/31/08	Other Relevant Information	Person-Years of Follow-Up
1	1/1/2003	Alive	Never lost to follow-up
2	1/1/2005	Dead	Died on 1/1/2006
3	1/1/2006	Unknown	Lost to follow-up on 1/1/2007
4	1/1/2006	Alive	Lost to follow-up from 1/1/2007 to 12/31/2007. Showed up alive at BHCHPon 1/1/2008 and known to be alive at end of follow-up.
5	1/1/2003	Unknown	Lost to follow-up on 12/31/2006

Fill in the person-year of follow up

Answer 1

Study Subject	First Seen at Health Care for the Homeless	Vital Status at End of Follow-up 12/31/08	Other Relevant Information	Person-Years of Follow-Up	Explanation
1	01-01-2003	Alive	Never lost to follow-up	6	Person was followed for 6 years (till 2008)
2	01-01-2005	Dead	Died on 1/1/2006	1	Person died after an year of follow up
3	01-01-2006	Unknown	Lost to follow-up on 1/1/2007	1	Person was lost to follow up after one year in 2007
4	01-01-2006	Alive	Lost to follow-up from 1/1/2007 to 12/31/2007. Showed up alive at BHCHPon 1/1/2008 and known to be alive at end of follow-up.	2	Person was not followed for an year in between
5	01-01-2003	Unknown	Lost to follow-up on 12/31/2006	4	Person lost to follow up after 4 years