A systematic review of types of healthy eating interventions in preschools

Table 2 Quality rating scheme

Rating	Definition	Study description	Design & methods
*	Weak	Many details missing (three or more of the following: setting, intervention design, duration, intensity, population or statistical analysis) irrelevant design or methods	Methodological flaws (in statistical methods used or design of intervention) or the intervention was in a non-natural environment i.e. food laboratory
**	Moderate	One or two details missing	Small sample size (<50) or short duration (<one week)
***	Strong	One or two details missing	Larger sample size or longer duration
****	Very Strong	Clearly presented with all details provided	Larger sample size or longer duration and at least one of the following criteria: population randomly allocated or matched for intervention or control, generalizable results, or validated dietary assessment

Adapted from Seymour et al. [15]. Table 2 showing the standars for quality rating of the studies.