Table 1.

Age in years by study.

Study	N	Mean	Standard Deviation	Minimum	Maximum
STUDY #1	100	37.1	12.2	18	70
STUDY #2	87	38.6	14.0	19	83
STUDY #3	87	39.0	12.8	19	71
STUDY #4	89	39.5	13.4	18	81
STUDY #5	121	39.2	13.1	18	76
Overall	484	38.6	13.1	18	83