Years of eligibility (N)	Potential participants (N)	Actual participants (N)	Retention rate (%)	Mean cumulative weight change (%)	Percentage with ≥5 % weight loss (%)
1	213,048	80,208	38	−5.6	47
2	189,268	42,651	23	−6.7	53
3	161,884	25,864	16	−6.9	56
4	131,460	15,983	12	−7.1	57
5	101,343	9,751	10	−7.5	59
6	70,678	5,487	8	−7.9	61
7	36,699	2,346	6	−8.2	62