. Author manuscript; available in PMC: 2020 May 1.

Published in final edited form as: Obesity (Silver Spring). 2019 Mar 6;27(5):700–706. doi: 10.1002/oby.22414

Table 1.

Sociodemographic characteristics of participants in four studies

Study Characteristics	PREFER	SMART	SELF	EMPOWER	Studies Combined
n	176	197	129	129	631
Years enrolled	2002–2004	2006–2008	2009–2011	2011–2015	2002–2015
Age, years Mean (SD)	44.03 (8.76)	46.60 (9.15)	52.97 (9.59)	50.80 (10.75)	48.04 (10.06)
BMI, kg/m² Mean (SD)	34.02 (4.09)	33.94 (4.46)	33.44 (3.87)	34.35 (4.65)	33.94 (4.28)
Sex, % female	86.90%	84.80%	82.90%	89.90%	86.1%
Race, % white	70.50%	77.70%	71.30%	81.40%	75.1%
Education, years Mean (SD)	15.20 (2.54)	15.61 (2.96)	15.91 (3.06)	16.46 (2.90)	15.73 (2.89)