Table 1

Descriptive statistics of the study sample
Variable Definition 2004 2006
Mean Std. Dev. Mean Std. Dev.
Outcome variables
Kilocalorie Average daily calorie intake (in kilocalories) 1,909.53 608.63 1,958.93 627.33
Carbohydrate Average daily carbohydrate intake (in grams) 255.70 95.81 268.68 92.46
Protein Average daily protein intake (in grams) 62.80 24.74 63.87 23.45
Fat Average daily fat intake (in grams) 70.52 32.33 70.31 36.01
Independent variables
Age Calculated age in years 11.43 2.73 13.40 2.72
Household income per capita Per capita household income (in thousand RMB at 2006) 6.55 6.01 7.13 6.68
Supermarket density Number of supermarkets within 5 km of neighborhood 6.59 5.87 3.08 3.25
Wet market density Number of wet markets within 5 km of neighborhood 6.25 7.88 4.17 4.57
Fast food restaurant density Number of fast food restaurants (e.g. McDonald’s, KFC) in neighborhood 1.02 2.68 0.45 2.35
Owning car Household automobile ownership (own = 1, not own = 0) 0.04 0.19 0.07 0.26
Bus stop Existence of bus stop(s) in neighborhood (yes = 1, no = 0) 0.70 0.46 0.77 0.42
Female Female = 1, male = 0 0.51 0.50 0.51 0.50
Maternal education Mother’s education in years 10.84 2.87 10.84 2.87
Child dummy 1 if aged 6–12, 0 if aged 13–17 0.66 0.48 0.45 0.50

Wang and Shi

Wang and Shi Italian Journal of Pediatrics 2012 38:30   doi:10.1186/1824-7288-38-30

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