Table 1 Characterization of children and adolescents

Age

13.0 ± 2.4

12.8 ± 2.3

13.2 ± 2.4

School

  Primary

472 (17.8%)

240 (18.5%)

232 (17.1%)

  Middle

1711 (64.5%)

885 (68.4%)

826 (60.8%)

  High

470 (17.7%)

169 (13.1%)

301 (22.1%)

Parents’ education level

  Under primary school

42 (1.6%) ^F, 113 (4.3%) ^M

23(1.8%) ^F, 61 (4.7%) ^M

19 (1.4%) ^F, 52 (3.8%) ^M

  Primary school

234 (8.8%) ^F, 361 (13.6%) ^M

109(8.4%) ^F, 179 (13.8%) ^M

125 (9.2%) ^F, 182 (13.4%) ^M

  Middle school

802 (30.2%) ^F, 773 (29.1%) ^M

384(29.7%) ^F, 357 (27.6%) ^M

418 (30.8%) ^F, 416 (30.6%) ^M

  High school

612 (23.1%) ^F, 481 (18.1%)

310(24.0%) ^F, 239 (18.5%) ^M

302 (22.2%) ^F, 242 (17.8%) ^M

  College

299 (11.3%) ^F, 331 (12.5%) ^M

145 (11.2%) ^F, 165 (12.8%) ^M

154 (11.3%) ^F, 166 (12.2%) ^M

  University bachelor

471 (17.8%) ^F, 448 (16.95) ^M

215 (16.6%) ^F, 211 (16.3%) ^M

256 (18.8%) ^F, 237 (17.4%) ^M

  University master or higher

193 (7.3%) ^F, 146 (5.5%) ^M

108 (8.3%) ^F, 82 (6.3%) ^M

85 (6.3%) ^F, 64 (4.7%) ^M

SES

  Very good

80 (3.0%)

54 (4.2%)

26 (1.9%)

  Good

773 (29.1%)

393 (30.4%)

380 (28.0%)

  Fair

1525 (57.5%)

716 (55.3%)

809 (59.5%)

  Poor

226 (8.5%)

107 (8.3%)

119 (8.8%)

  Very poor

49 (1.8%)

24 (1.9%)

25 (1.8%)

MVPA

  0 days

141 (5.3%)

56 (4.3%)

85 (6.3%)

  1 days

202 (7.6%)

86 (6.6%)

116 (8.5%)

  2 days

299 (11.3%)

127 (9.8%)

172 (12.7%)

  3 days

465 (17.5%)

237 (18.3%)

228 (16.8%)

  4 days

558 (21.0%)

266 (20.6%)

292 (21.5%)

  5 days

353 (13.3%)

165 (12.8%)

188 (13.8%)

  6 days

351 (13.2%)

179 (13.8%)

172 (12.7%)

  7 days

284 (10.7%)

178 (13.8%)

106 (7.8%)

Academic achievement

  Very good

118 (4.4%)

71 (5.5%)

47 (3.5%)

  Good

709 (26.7%)

359 (27.7%)

350 (25.8%)

  Average

1566 (59.0%)

720 (55.6%)

846 (62.3%)

  Below average

260 (9.8%)

144 (11.1%)

116 (8.5%)

Academic burden

  Much

444 (16.7%)

237 (18.3%)

207 (15.2%)

  Some

1028 (38.7%)

497 (38.4%)

531 (39.1%)

  A little

919 (34.6%)

427 (33.0%)

492 (36.2%)

  None

262(9.9%)

133 (10.3%)

129 (9.5%)