“…Following resolution of the discrepancies of the articles' coding, we categorized them into five domains: (a) topic area, (b) research design, (c) participant characteristics, (d) target population of the primary topic, and (e) age range/developmental period; these are found in Tables 1, 2, 3, 4 and 5, respectively. Congruent with the methodology of previous reviews, we assigned each article a primary topic “…based on the article’s conceptual model, research questions and hypotheses, results, and discussion” (Wei et al, 2014, p. 270). We used the same topic areas reported in Wei et al’s (2014) review, which were accumulated from past reviews; however, we changed the “Measurement” topic introduced in Wei et al’s (2014) review to “Measurement and methodology,” and we added a new topic called “Cognition,” which is derived from Wei et al’s (2014)
cognitive processing subtopic under “Miscellaneous.” Similar to Yeh et al’s (2013) and Wei et al’s (2014) reviews, we coded solely for the primary topic (rather than coding for both a primary and a secondary topic, which was the approach utilized in Okazaki et al’s (2011) and Juan et al’s (2012) reviews).…”