Descriptive characteristics of included studies.

Acronyms: D & B score (Downs & Black score); None OW/OB (none were overweight/obese); BMI (Body Mass Index); CDC-NCHS (Centers for Disease Control and Prevention – National Center for Health Statistics); WHO (World Health Organization); IOTF (International Obesity Task Force).a = Identical study sample as used in another included manuscript (not included in quantitative synthesis) [n = 27].b = Article indicated targeting a sample size representative of the population of interest [n = 38].c = Article indicated recruiting a sample size representative of the population of interest [n = 31].d = Article indicated that the sample size was nationally representative [n = 11].