Table 2.

Characteristics of supervised exercise intervention primary studies included in meta-analyses

Characteristic	k	Min	Q1	Mdn	Q3	Max
Treatment group sample size	32	6	12.5	18.5	55	198
Control group sample size	13	9	12	18	39	135
Percentage female	32	0	84	100	100	100
Percentage African-American	32	0	64	100	100	100
Percentage Hispanic	29	0	0	0	21	100
Percent European-American	28	0	0	0	0	36
Mean age (years)	30	20	33	44	56.3	76.4
Minutes of supervised exercise per session	23	25	32.5	38.5	52.5	60
Frequency per week of supervised PA	27	1	2	3	3	4
Total number of supervised exercise sessions	27	8	20	33	48	84

Note. Includes all studies that contributed to primary analyses at least one effect size for any type of comparison. Not all studies reported information in the table.

k = number of studies providing data on characteristic; Q₁ = first quartile, Q₃ = third quartile.