OBAYA (obesity and adverse health outcomes in young adults): feasibility of a population-based multiethnic cohort study using electronic medical records

Table 3 **Retention* of young adults in the health plan**

Year of enrollment into cohort		Retention of young adults in health plan (%)
		Baseline	1 year	2 years	3 years
	Age (years)	%	%	%	%
2007	20.0-24.9	100	87.7	71.5	58.1
	25.0-29.9	100	88.8	75.6	65.6
	30.0-34.9	100	91.3	80.4	71.8
	35.0-39.9	100	92.7	83.4	75.6
	All ages	100	90.3	78.2	68.4
2008	20.0-24.9	100	86.7	69.2
	25.0-29.9	100	86.6	70.6
	30.0-34.9	100	88.9	75.3
	35.0-39.9	100	90.4	78.5
	All ages	100	88.1	73.2
2009	20.0-24.9	100	86.4
	25.0-29.9	100	84.7
	30.0-34.9	100	87.0
	35.0-39.9	100	88.2
	All ages	100	86.4
All years	20.0-24.9	100	87.0	70.6	58.1
	25.0-29.9	100	87.5	74.0	65.6
	30.0-34.9	100	90.0	78.8	71.8
	35.0-39.9	100	91.5	82.0	75.6
	All ages	100	89.0	76.5	68.4

*Retention is defined as proportion of active members 20-39 years retained in the health plan on December 31 of each year.

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