Table I.
Registry codes used to identify study variables
| Variable | Codes |
|---|---|
| Atopic dermatitis | ICD-8: 691; ICD-10: L20 |
| Azathioprine | ATC code: L04AX01; procedure code: BWHB83 |
| Methotrexate | ATC code: L01BA01, L04AX03; procedure code: BWHA115 |
| Cyclosporine | ATC code: L04AD01; procedure code: BOHJ20 |
| Mycophenolate | ATC code: L04AA06; procedure code: BOHJ22 |
| Phototherapy | Procedure code: BNGA1, BNGA2, BNGA3, BNGA4 |
| Atrial fibrillation and flutter | ICD-8: 42793, 42794; ICD-10: I48 |
| Allergic asthma | ICD-8: 493; ICD-10: J450 |
| Allergic rhinitis | ICD-8: 50709; ICD-10: J301-J304 |
| Chronic obstructive pulmonary disease or nonallergic asthma | ICD-8: 491, 492; ICD-10: J41, J42, J43, J44, J45 (except J450), J46; ATC code: R03 (at least 2 prescriptions) except if the person has a prevalent allergic asthma diagnosis |
| Cardiovascular disease, including structural valve problems, hypertension, ischemic heart disease, and heart failure | ICD-8: 393-398, 400-404, 410-414, 425, 42709, 42710, 42711, 42719, 78249; ICD-10: I05-I09, I10-I15, I20-I25, I34-I37, I390, I393, I42 (excluding I426 included below), I43, I50, I511A, Q22; ATC code: C01DA, C02, C03,C07, C08, C09, B01AC04, B01AC06, N02BA01; Procedure code: 30009, 30019, 30029, 30039, 30049, 30059, 30069, 30079, 30089, 30099, 30109, 30119, 30120, 30129, 30139, 30149, 30159, 30169, 30179, 30189, 30199, 30200 30300, 30310, 30320, 30330, 30340, 30350, 30360, 30600, 30620, 30640, 30660, 30700, 30701, 30709, 30719, 30720, 30729, 30740, 30780, 30799, 30800, 30810, 30910, 30920, 30925, 30939, 30959, 30990, 31100, 31101, 31119, 31129, 31130, 31180, 31199, 31200, 31210, 31220, 31229, 31230, 31249, 31259, 31268, 31269, 31280, 31299, 31310, 30350, 30354, 30240, KFNA-E, KFNH20, KFM (excluding KFMA32, KFMD10-14, KFMH10), KFK (excluding KFKA32, KFKC70, KFKH10), KFG (excluding KFGA32) KFJE (excluding KFJE42), KFJF, KFJW, KFNG, KFNF |
| Rheumatic disease | ICD-8: 28709, 69609, 712, 716, 734, 446; ICD-10: D690B, G737, G058A, H221B, I328A, I328B, I398C, I398E, I418A, I528A, I776, L931, L932, L95, M05-M07, M30-M36, M45, M793, N085, N164 |
| Sleep apnea | ICD-10: G473 |
| Obesity | ICD-8: 277; ICD-10: E65-E66 |
| Hyperthyroidism | ICD-8: 242; ICD-10: E05, H062, E060, E062; ATC code: H03B |
| Chronic kidney disease | ICD-8: 584, 792, 9977, Y9509; ICD-10: L298C, G638A, E853B, T825A, T825B, T825C, T856C, I120, I131, I132, I770, N165, N180, N183, N184, N185, N188, N189, N19, T824, T861, Z49, Z94, Z992, T817E1; procedure code: KJAK10, KJAK11, KJAK13, KJAK14, KTJA30, KTJA32, KTJA35, KKAS, BJFD2, BJFZ, BJKB, BUFC1, BWDC5, ZZ0151A, ZZ4341, ZZ4342, ZZ4343, ZZ4346, ZZ4347, ZZ4348, ZZ4350, 57480, 57490, 87409, 87419, 87420, 87430, 87431, 87432, 87440, 92390, 92400, 94300, 94340 |
| Diabetes mellitus | ICD-8: 249-250; ICD-10: E10-E14, H360, O24 (except O244), H360, N083, DG632; ATC code: A10 |
| Alcoholism-related disorder or prescription | ICD-8: 291, 303, 57109-57110, 57710, 979, 980; ICD-10: F10, G312, G621, G721, I426, K292, K700, K703, K860, R780, T510, T519, Z721; ATC code: N07BB01 |
Only primary and secondary diagnoses from the Danish National Patient Registry are included.
ATC, Anatomical therapeutic chemical; ICD8, International Classification of Diseases, 8th Revision; ICD10: International Classification of Diseases, 10th Revision.