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Table 2 Baseline characteristics of the study population based on migraine diagnoses shown in prevalence and medians (N = 62,578)

From: Mid- to late-life migraine diagnoses and risk of dementia: a national register-based follow-up study

  Any ICD-8 and ICD-10 migraine diagnosis Comparison cohort Any ICD-8
migraine diagnosis
Any ICD-10
migraine diagnosis
Migraine without aura in
ICD-10
Migraine with aura in
ICD-10
Characteristics n = 10,857 (17%) n = 51,721 (83%) n = 2183 (20%) n = 8674 (80%) n = 2845 (26%) n = 1698 (16%)
Age, median (IQR)
 Years 49 (44–53) 49 (44–53) 43 (38–47) 50 (46–54) 50 (46–54) 51 (47–54)
Sex, No. (%)
 Women 7975 (73) 38,104 (74) 1574 (72) 6401 (74) 2239 (79) 1200 (71)
Country of origin, No. (%)
 Danish 10,087 (93) 49,177 (95) 2118 (97) 7970 (92) 2615 (92) 1586 (93)
 Western 272 (2) 1399 (3) 35 (2) 237 (3) 76 (3) 55 (3)
 Non-Western 498 (5) 1145 (2) 31 (1) 467 (5) 154 (5) 57 (3)
Marital status, No. (%)
 Unmarried 3029 (28) 15,027 (29) 566 (26) 2,463 (28) 824 (29) 432 (25)
Educational level, No. (%)
 Low 3799 (35) 17,757 (34) 976 (45) 2,823 (32) 904 (32) 530 (31)
 Medium 4173 (38) 20,366 (40) 814 (37) 3359 (39) 1089 (38) 656 (39)
 High 2885 (27) 13,598 (26) 394 (18) 2492 (29) 852 (30) 512 (30)
Previous headache diagnoses, No. (%)
 Yes 600 (6) 524 (1) 63 (3) 537 (6) 210 (7) 86 (5)
Previous psychiatric diagnoses, No. (%)
 Yes 748 (7) 2185 (4) 126 (6) 622 (7) 191 (7) 115 (7)
Charlson Comorbidity Index, No. (%)
 0 10,059 (93) 48,729 (94) 2135 (98) 7925 (91) 2,577 (91) 1542 (91)
 ≥1 789 (7) 2992 (6) 49 (2) 749 (9) 268 (9) 156 (9)
Migraine contacts, median (IQR)
 Number 1 (1–2) 1 (1–1) 1 (1–2) 1 (1–2) 1 (1–2)
  1. ICD International Classification of Diseases 8th (ICD-8) and 10th version (ICD-10), IQR interquartile ranges