Table 2.

Demographic characteristics of the 87 intervention groups by randomization group

	Usual care	Intervention group
Mean sample size expressed as number of subjects (min–max) (n = 82)	61.4 (5–1,113)	64.1 (4–1,189)
Average age expressed in years (min–max) (n = 60)	47.5 (3.0–73.7)	46.8 (3.4–76.2)
Gender expressed as % female (n = 59)	55.3 %	55.5 %
Ethnicity expressed as % Caucasian (n = 28)	36.0 %	39.5 %