Presence of chronic physical and mental conditions per identification method
| Total cohort n (%) | Method A n (%) | Method B n (%) | Method C n (%) | Method D n (%) | All methods combined n (%) | |
| Chronic physical condition | 101 868 (60.2) | 5624 (66.9) | 9446 (79.4) | 3957 (70.0) | 280 (58.1) | 15 313 (73.4) |
| Chronic mental condition | 30 750 (18.2) | 2838 (33.8) | 4188 (35.2) | 2020 (36.2) | 289 (60.0) | 7080 (33.9) |
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Method A: patients with recorded FM, IBS, and/or CFS based on ICPC-codes.
Method B: patients with at least six ICPC codes that correspond to the Robbins list in any 6 month period.
Method C: patients with reported PSS-related terminology.
Method D: patients with ≥20 points on the somatisation subscale of the 4DSQ.
CFS, chronic fatigue syndrome; 4DSQ, Four-Dimensional Symptom Questionnaire; FM, fibromyalgia; IBS, irritable bowel syndrome; ICPC, International Classification of Primary Care; PSS, persistent somatic symptoms.