Table 1.
Basic characteristics of the study sample (after 1:1 matching by sex, age, index year, and yearly consultation frequency).
| Variable | Proportion affected among individuals with infectious mononucleosis (%) | Proportion affected among individuals without infectious mononucleosis (%) | p-value |
|---|---|---|---|
| n=16,058 | n=16,058 | ||
| Age (Mean, SD) | 31.6 (15.0) | 31.7 (15.1) | 0.494 |
| Age 14-20 | 4,969 (30.9) | 4,815 (30.0) | 0.440 |
| Age 21-30 | 4,240 (26.4) | 4,325 (26.9) | |
| Age 31-40 | 2,734 (17.0) | 2,740 (17.1) | |
| Age 41-50 | 1,991 (12.4) | 2,024 (12.6) | |
| Age >50 | 2,124 (13.2) | 2,154 (13.4) | |
| Women | 9,407 (58.6) | 9,407 (58.6) | 1.000 |
| Men | 6,651 (41.4) | 6,651 (41.4) | |
| Yearly consultation frequency | 3.5 (4.3) | 3.5 (4.3) | 1.000 |
| Autoimmune disorders (any) | 908 (5.7) | 892 (5.6) | 0.700 |
| Type 1 diabetes | 60 (0.4) | 129 (0.8) | <0.001 |
| Rheumatoid arthritis | 228 (1.4) | 164 (1.0) | 0.001 |
| Psoriasis | 226 (1.4) | 223 (1.4) | 0.887 |
| Lupus erythematosus | 7 (0.04) | 3 (0.02) | 0.206 |
| Hashimoto’s thyroiditis | 332 (2.1) | 294 (1.8) | 0.125 |
| Inflammatory bowel disease | 118 (0.7) | 125 (0.8) | 0.652 |
Proportions of patients given in %, unless otherwise indicated. SD, standard deviation.