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Table 1 Distribution of participants according to the applied variables by gender

From: Validity of self-reported height and weight among adolescents: the importance of reporting capability

  Total study population Boys Girls
(N = 2100) N = 1031 N = 1069
  n (%) n (%) n (%)
Age    
11 years 755 (36.0) 366 (35.5) 389 (36.4)
13 years 775 (36.9) 378 (36.7) 397 (37.1)
15 year 570 (27.1) 287 (27.8) 283 (26.5)
Last weighed…    
Within past week 707 (33.7) 315 (30.6) 392 (36.7)*
Within past month 725 (34.5) 351 (34.0) 374 (35.0)
Within past half year 354 (16.9) 199 (19.3) 155 (14.5)
Since longer 86 (4.1) 45 (4.4) 41 (3.8)
Cannot remember 200 (9.5) 105 (10.2) 95 (8.9)
Missing 28 (1.3) 16 (1.6) 12 (1.1)
Last height measured…    
Within past week 315 (15.0) 171 (16.6) 144 (13.5)
Within past month 634 (30.2) 304 (29.5) 330 (30.9)
Within past half year 678 (32.3) 331 (32.1) 347 (32.5)
Since longer 205 (9.8) 91 (8.8) 114 (10.7)
Cannot remember 246 (11.7) 122 (11.8) 124 (11.6)
Missing 22 (1.1) 12 (1.2) 10 (0.9)
Can remember weight…    
Exactly 540 (25.7) 272 (26.4) 268 (25.1)
Approximately 1147 (54.6) 556 (53.9) 591 (55.3)
Not very well 246 (11.7) 115 (11.2) 131 (12.3)
Don’t remember 133 (6.3) 72 (7.0) 61 (5.7)
Missing 34 (1.6) 16 (1.6) 18 (1.7)
Can remember height…    
Exactly 489 (23.3) 224 (21.7) 265 (24.8)*
Approximately 1185 (56.4) 587 (56.9) 598 (55.9)
Not very well 271 (12.9) 127 (12.3) 144 (13.5)
Don’t remember 132 (6.3) 82 (8.0) 50 (4.7)
Missing 23 (1.1) 11 (1.1) 12 (1.1)
Response capability for weight    
Weighed recently + high recall ability 1317 (62.7) 617 (59.8) 700 (65.5)*
Weighed recently + low recall ability 109 (5.2) 47 (4.6) 62 (5.8)
Not weighed recently + high recall ability 367 (17.5) 209 (20.3) 158 (14.8)
Not weighed recently + low recall ability 269 (12.8) 140 (13.6) 129 (12.1)
Missing 38 (1.8) 18 (1.8) 20 (1.9)
Response capability for height    
Measured recently + high recall ability 1420 (67.6) 698 (67.7) 772 (67.5)
Measured recently + low recall ability 203 (9.7) 107 (10.4) 96 (9.0)
Not measured recently + high recall ability 251 (12.0) 112 (10.9) 139 (13.0)
Not measured recently + low recall ability 198 (9.4) 101 (9.8) 97 (9.1)
Missing 28 (1.3) 13 (1.3) 15 (1.4)
Response capability combined for height and weight    
High 1023 (48.7) 491 (47.6) 532 (49.8)
Low 1026 (48.9) 517 (50.2) 509 (47.6)
Missing 51 (2.4) 23 (2.2) 28 (2.6)
Family occupational social class    
High 902 (43.0) 449 (43.6) 453 (42.4)*
Middle 559 (26.6) 264 (25.6) 295 (27.6)
Low 304 (14.5) 131 (12.7) 173 (16.2)
Un-classifiable 297 (14.1) 166 (16.1) 131 (12.3)
Missing 38 (1.8) 21 (2.0) 17 (1.6)
Family structure    
Traditional family 1160 (55.2) 585 (56.7) 575 (53.8)
Reconstructed family 191 (9.1) 80 (7.8) 111 (10.4)
Single-parent family 422 (20.1) 206 (20.0) 216 (20.2)
Other 15 (0.7) 5 (0.5) 10 (0.9)
Missing 312 (14.9) 155 (15.0) 157 (14.7)
Migration status    
Danish 1734 (82.6) 858 (83.2) 876 (81.9)
Decendants 236 (11.2) 104 (10.1) 132 (12.4)
Immigrants 109 (5.2) 55 (5.3) 54 (5.1)
Missing 21 (1.0) 14 (1.4) 7 (0.7)
  1. * Significant difference in distribution between boys and girls, tested by chi square test (p < 0.05) (not accounting for the design effect caused by the applied cluster sampling). Missing values are not included in analyses.