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Table 1 Descriptive Statistics across the whole sample and by school SEC

From: Overweight and obesity by school socioeconomic composition and adolescent socioeconomic status: a school-based study

Variables All   School SEC  
Low (n = 3) Medium (n = 5) High (n = 3)
Age (M, SD) 15.92 (1.33) 16.61 (1.16) 15.37 (1.24) 15.82 (1.26)
Sex (n, %)
 Boys 515 (49.6%) 186 (53.6%) 195 (51.6%) 142 (45.4%)
 Girls 523 (50.4%) 161 (46.4%) 183 (48.4%) 171 (54.6%)
Body Mass Index
 Weight / Height (M, SD) 20.83 (3.32) 21.97 (3.8) 20.59 (3.09) 19.85 (2.57)
 CDC Z-Scores (M, SD) −0.09 (1.01) 0.11 (1.05) −0.04 (0.97) −0.37 (0.94)
 Underweight 65 (6.3%) 16 (4.6%) 22 (5.8%) 27 (8.6%)
 Normal Weight 846 (81.5%) 274 (79.0%) 308 (81.5%) 264 (84.3%)
 Overweight 92 (8.9%) 38 (11.0%) 36 (9.5%) 18 (5.8%)
 Obesity 35 (3.4%) 19 (5.5%) 12 (3.2%) 4 (1.3%)
 Overweight|Obesity 127 (12.2%) 57 (16.4%) 48 (12.7%) 22 (7.0%)
Physical Activity
 Low 282 (27.2%) 142 (40.9%) 79 (20.9%) 61 (19.5%)
 Medium 623 (60.0%) 162 (46.7%) 245 (64.8%) 216 (69.0%)
 High 133 (12.8%) 43 (12.4%) 54 (14.3%) 36 (11.5%)
Adolescent SES
 Low 351 (33.8%) 214 (61.7%) 108 (28.6%) 29 (9.3%)
 Medium 277 (26.7%) 63 (18.2%) 118 (31.2%) 96 (30.7%)
 High 368 (35.5%) 50 (14.4%) 137 (36.2%) 181 (57.8%)
 NA 42 (4.1%) 20 (5.8%) 15 (4.0%) 7 (2.2%)
School Lunch (n, %)
 Lunch outside school 490 (47.2%) 304 (87.6%) 189 (50.0%) 55 (17.6%)
 Lunch at school 548 (52.8%) 43 (12.4%) 189 (50.0%) 258 (82.4%)
Household Composition
 Live with both parents 680 (65.5%) 218 (62.8%) 231 (61.1%) 231 (73.8%)
 Do not live with both parents 358 (34.5%) 129 (37.2%) 147 (38.9%) 82 (26.2%)
 Number of Siblings (M, SD) 2.13 (1.55) 2.9 (1.76) 1.92 (1.45) 1.54 (0.98)
Overall 1038 (100.0%) 347 (100.0%) 378 (100.0%) 313 (100.0%)