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Table 1 Characterization of children and adolescents

From: Associations of physical activity with academic achievement and academic burden in Chinese children and adolescents: do gender and school grade matter?

Variables Total (n = 2653) Boys (n = 1294, 48.8%) Girls (n = 1359, 51.2%)
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%)
  1. Notes: MVPA Moderate-to-Vigorous Physical Activity: number of days that children and adolescents are physically active for at least 60 min, SES social economic status, F: Father’s education level, M: Mother’s education level