Table 1.
General characteristics of participants and convenience stores in the study
| Variables | All | Dongcheng District | Miyun District | Pa |
|---|---|---|---|---|
| Age, year (mean ± SD) | 10.2 ± 0.33 | 10.2 ± 0.33 | 10.3 ± 0.33 | 0.017b |
| Gender (%) | 0.423c | |||
| Boy | 1107 (50.3) | 633 (49.6) | 474 (51.3) | |
| Girl | 1094 (49.7) | 644 (50.4) | 450 (48.7) | |
| Obesity (%) | 0.618c | |||
| Yes | 329 (14.9) | 195 (15.3) | 134 (14.5) | |
| No | 1872 (85.1) | 1082 (84.7) | 790 (85.5) | |
| Family type (%) | < 0.001c | |||
| with only one child | 1595 (73.2) | 1014 (80.2) | 581 (63.6) | |
| with more than one child | 584 (26.8) | 251 (19.8) | 333 (36.4) | |
| Father’s Obesity (%) | < 0.001c | |||
| Yes | 381 (17.7) | 192 (15.3) | 189 (21.1) | |
| No | 1767 (82.3) | 1060 (84.7) | 707 (78.9) | |
| Mother’s Obesity (%) | < 0.001c | |||
| Yes | 149 (6.9) | 59 (4.7) | 90 (10.0) | |
| No | 2002 (93.1) | 1190 (95.3) | 812 (90.0) | |
| Father’s Education (%) | < 0.001c | |||
| Primary school or below | 59 (2.7) | 13 (1.0) | 46 (5.1) | |
| Junior high school | 338 (15.7) | 72 (5.8) | 266 (29.7) | |
| High school or Technical secondary school | 461 (21.5) | 159 (12.7) | 302 (33.7) | |
| Junior college or Vocational college | 400 (18.6) | 253 (20.2) | 147 (16.4) | |
| University degree or above | 891 (41.5) | 755 (60.3) | 136 (15.2) | |
| Mother’s Education (%) | < 0.001c | |||
| Primary school or below | 74 (3.4) | 23 (1.8) | 51 (5.7) | |
| Junior high school | 376 (17.5) | 81 (6.5) | 295 (32.8) | |
| High school or Technical secondary school | 435 (20.2) | 166 (13.3) | 269 (29.9) | |
| Junior college or Vocational college | 423 (19.7) | 279 (22.3) | 144 (16.0) | |
| University degree or above | 843 (39.2) | 702 (56.1) | 141 (15.7) | |
| Number of convenience stores within 800 m network buffer near school | 0.597d | |||
| Median | 24 | 25 | 22 | |
| Interquartile range | (14, 43) | (15, 38) | (3, 45) | |
| Range | (1, 67) | (5, 67) | (1, 57) | |
a P value for differences in general characteristics between Dongcheng district and Miyun district
b Difference was tested using t test
c Difference was tested using chi-square test
d Difference was tested using Wilcoxon signed-rank test