Table 1

Social and preinjury health characteristics of patients with mTBI and controls

Controls
(n=18 640)
mTBI
(n=19 732)
Total
(n=38 372)
MissingP value*
Age, years, n (%)0.8461
 18–298187 (43.92)8734 (44.26)16 921 (44.10)0
 30–394118 (22.09)4290 (21.74)8408 (21.91)
 40–493458 (18.55)3653 (18.51)7111 (18.53)
 50–602877 (15.43)3055 (15.48)5932 (15.46)
Gender, n (%)0.5839
 Male11 266 (60.44)11 872 (60.17)23 138 (60.30)0
 Female7374 (39.56)7860 (39.83)15 234 (39.70)
Education, n (%)<0.0001
 Low education6942 (37.73)8951 (46.14)15 893 (42.05)574
 Medium education7992 (43.43)7464 (38.48)15 456 (40.89)
 High education3466 (18.84)2983 (15.38)6449 (17.06)
Income (Danish kroner, Kr†), n (%)<0.0001
 <100 0004144 (22.27)4482 (22.72)8626 (22.50)40
 100 000–200 0004152 (22.31)5697 (28.89)9849 (25.69)
 200 000–300 0005325 (28.62)5418 (27.47)10 743 (28.03)
 >300 0004988 (26.80)4126 (20.92)9114 (23.78)
Cohabitation status, n (%)<0.0001
 Married or cohabiting couple5701 (30.68)8051 (40.83)13 752 (35.90)70
 Single12 884 (69.32)11 666 (59.17)24 550 (64.10)
Ethnic origin, n (%)0.5772
 Danish born17 659 (95.02)18 710 (94.89)36 369 (94.95)70
 Born abroad926 (4.98)1007 (5.11)1933 (5.05)
CCI (categorical), n (%)<0.0001
 No comorbidities17 863 (95.83)18 580 (94.16)36 443 (94.97)0
 One comorbidity577 (3.10)842 (4.27)1419 (3.70)0
 Two comorbidities154 (0.83)210 (1.06)364 (0.95)0
 Three comorbidities46 (0.25)100 (0.51)146 (0.38)0
Psychiatric diagnosis, n (%)<0.0001
 No diagnosis18 345 (98.42)18 540 (93.96)36 885 (96.12)0
 ≥1 diagnosis295 (1.58)1192 (6.04)1487 (3.88)
  • *P value from a Pearson’s χ2 test.

  • †Currency exchange rate of May 2018: 1€=7.44834 Kr.

  • CCI, Charlson comorbidity index; mTBI, mild traumatic brain injury.