Table 1 Demographic characteristics of students according to sex: The CASPIAN V study
| Â | Total | Boy | Girl | p-value |
|---|---|---|---|---|
Age (year) | 12.28 (3.15) | 12.39 (3.14) | 12.17 (3.16) |  < 0.001 |
Area of residence | ||||
 Urban | 10,194 (71.42) | 5150 (71.25) | 5044 (71.59) | 0.66 |
 Rural | 4080 (28.58) | 2078 (28.75) | 2002 (28.41) | |
SES | ||||
 T1 | 4559 (33.46) | 2325 (33.58) | 2234 (33.33) | 0.08 |
 T2 | 4515 (33.14) | 2343 (33.84) | 2172 (32.4) | |
 T3 | 4552 (33.41) | 2255 (32.57) | 2297 (34.27) | |
PA | ||||
 Low | 2147 (31.92) | 2147 (31.92) | 2307 (35) |  < 0.001 |
 Moderate | 4424 (33.22) | 2219 (32.99) | 2205 (33.45) | |
 High | 4440 (33.34) | 2360 (35.09) | 2080 (31.55) | |
ST | ||||
 Low | 11,644 (83.85) | 5863 (83.44) | 5781 (84.27) | 0.18 |
 High | 2243 (16.15) | 1164 (16.56) | 1079 (15.73) | |
FH of obesity | ||||
 No | 9947 (69.69) | 5070 (70.14) | 4877 (69.22) | 0.23 |
 Yes | 4327 (30.31) | 2158 (29.86) | 2169 (30.78) | |