Table 2.

Diagnoses associated with frequent attender 10% (FA10), high cost users (HC10) and both FA10 and HC10 (registered for physician consultations, adjusted for age, sex and industry), n = 29,380

	FA10		HC10		FAHC (FA10 & HC10)
ICD-10	OR	95% CI	OR	95% CI	OR	95% CI
A00-B99 Certain infectious and parasitic diseases	2.43	2.18–2.71	2.34	2.09–2.63	2.67	2.36–3.03
F00-F99 Mental and behavioural disorders	4.34	3.96–4.76	3.52	3.19–3.87	4.16	3.74–4.62
G00-G99 Diseases of the nervous system	2.74	2.44–3.08	3.41	3.04–3.83	3.32	2.91–3.77
I00-I99 Diseases of the circulatory system	1.82	1.63–2.03	2.09	1.88–2.33	2.14	1.89–2.43
J00-J99 Diseases of the respiratory system	2.47	2.30–2.66	2.31	2.15–2.49	2.98	2.73–3.26
K00-K93 Diseases of the digestive system	2.45	2.18–2.75	2.76	2.45–3.10	2.82	2.47–3.21
L00-L99 Diseases of the skin and subcutaneous tissue	2.18	1.97–2.41	2.22	2.00–2.46	2.45	2.19–2.75
M00-M99 Diseases of the musculoskeletal system and connective tissue	4.09	3.79–4.41	3.90	3.61–4.21	4.67	4.24–5.13
R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified	2.92	2.69–3.17	3.02	2.78–3.28	3.41	3.11–3.75
S00-T98 Injury, poisoning and certain other consequences of external causes	3.11	2.87–3.38	2.03	1.86–2.22	2.42	2.20–2.68

OR Odds ratio, CI Confidence interval

The diagnostic groups were used as dummy variables (No = reference group = 1.00)

ICD-10 = International Classification of Diseases

The 10 largest ICD-10 groups are presented