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Table 1 Characteristics of the study population

From: Reading and writing difficulties and self-rated health among Danish adolescents: cross-sectional study from the FOCA cohort

  Total
N = 9748
n (%) or mean (SD)
RWD
N = 953 (9.8)
n (%) or mean (SD)
Non-RWD
N = 8795 (90.2)
n (%) or mean (SD)
p
Self-rated health     < 0.001b*
 Low (%) 2606 (26.7) 338 (35.5) 2268 (25.8)  
 High (%) 6386 (65.5) 494 (51.8) 5892 (67.0)  
 Missing (%) 756 (7.8) 121 (12.7) 635 (7.2)  
Gender     0.055 b
 Female (%) 4973 (51.0) 458 (48.1) 4515 (51.3)  
 Male (%) 4775 (49.0) 495 (51.9) 4280 (48.7)  
 Alder, mean (SD) 15.8 (0.4) 16.0 (0.5) 15.8 (0.4) < 0.001c*
Self-assessed SES     < 0.001b*
 Low (%) 233 (2.4) 49 (5.1) 184 (2.1)  
 Medium (%) 5411 (55.5) 552 (57.9) 4859 (55.3)  
 High (%) 3529 (36.2) 248 (26.0) 3281 (37.3)  
 Missing (%) 575 (5.9) 104 (10.9) 471 (5.4)  
Negative childhood events     < 0.001b*
 0 events (%) 940 (9.6) 84 (8.8) 856 (9.7)  
 1–3 events (%) 5769 (59.2) 433 (45.4) 5336 (60.7)  
 4–7 events (%) 1616 (16.6) 181 (19.0) 1435 (16.3)  
 8–11 events (%) 234 (2.4) 56 (5.9) 178 (2.0)  
 Missing (%) 1189 (12.2) 199 (20.9) 990 (11.3)  
Loneliness     < 0.001b*
 Not lonely (%) 7358 (75.5) 609 (63.9) 6749 (76.7)  
 Lonely (%) 2379 (24.4) 341 (35.8) 2038 (23.2)  
 Missing (%) 11 (0.1) 3 (0.3) 8 (0.1)  
 Perceived stress a, mean (SD) 14.3 (6.4) 16.5 (6.1) 14.1 (6.4) < 0.001c*
  1. a = Scale from 0 to 40; higher = more stress, b = chi2, c = t-test, *statistical significant p < 0.05