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 |