Descriptive Statistics of the Study Sample (Year = 2009).

Note: Missing values for Academic performance scores were 60 (percent of missing = 2.70%), for age were 74 (percent of missing = 3.33%), for gender were 97 (percent of missing = 4.36%), for household income were 122 (percent of missing = 5.48%), for family structure were 104 (percent of missing = 4.67%), for mother’s education were 112 (percent of missing = 5.03%), for father’s education were 113 (percent of missing = 5.08%), for attending extracurricular activities were 91 (percent of missing = 4.09%), for average time spent on homework were 85 (percent of missing = 3.82%), for weight status were 490 (percent of missing = 22.02%), for rhinitis were 94 (percent of missing = 4.22%) and for asthma were 91 (4.09%).Descriptive Statistics of the Study Sample (Year = 2009).