| Primary care chest imaging referral (n = 151) | Secondary care chest imaging referral (n = 190) | ||||
|---|---|---|---|---|---|
| ICD-10 code and diagnosis | Prevalence, % | OR (95%CI)b | ICD-10 code and diagnosis | Prevalence, % | OR (95%CI)b |
| J42 Chronic bronchitis | 5.3 | 14.9 (3.1 to 70.4) | R01 Cardiac murmurs and other cardiac sounds | 1.6 | 12.0 (1.2 to 115.4) |
| R042 Haemoptysis | 3.3 | 10.0 (1.9 to 51.5) | Z51 Encounter for other aftercare and medical care | 2.1 | 8.0 (1.5 to 43.7) |
| W19 Unspecified fall | 2.6 | 8.0 (1.5 to 43.7) | I73 Other peripheral vascular diseases | 8.0 | 5.4 (2.5 to 11.8) |
| L20 Atopic dermatitis | 2.6 | 8.0 (1.5 to 43.7) | N20 Calculus of kidney and ureter | 2.1 | 4.7 (1.0 to 21.4) |
| R05 Cough | 22.5 | 7.2 (4.0 to 13.0) | M06 Rheumatoid arthritis, unspecified | 4.3 | 4.6 (1.7 to 12.6) |
| J18 Pneumonia | 15.9 | 5.4 (2.9 to 10.0) | J44 COPD | 17.2 | 3.8 (2.2 to 6.3) |
| R700 Elevated erythrocyte sedimentation rate | 2.6 | 5.3 (1.2 to 23.8) | F17 Mental and behavioural disorders due to use of tobacco | 6.4 | 3.7 (1.7 to 8.3) |
| R49 Voice and resonance disorders | 3.3 | 4.8 (1.3 to 18.1) | M05 Rheumatoid arthritis with rheumatoid factor | 3.2 | 3.4 (1.2 to 10.2) |
| Z72 Problems related to lifestyle | 4.6 | 4.6 (1.5 to 13.6) | Z13 Special screening examination for other diseases | 3.7 | 3.7 (1.3 to 10.8) |
| R060 Dyspnoea | 7.3 | 3.8 (1.6 to 8.8) | R060 Dyspnoea | 5.3 | 2.8 (1.2 to 6.4) |
| R52 Pain, unspecified | 14.6 | 3.6 (2.0 to 6.6) | M54 Dorsalgia | 22.3 | 2.3 (1.5 to 3.5) |
| B34 Viral infection | 4.6 | 3.5 (1.3 to 9.6) | J18 Pneumonia | 6.9 | 2.2 (1.1 to 4.5) |
| J44 COPD | 18.5 | 3.4 (2.0 to 5.7) | I25 Chronic ischaemic heart disease | 14.9 | 1.6 (1.0 to 2.7) |
| J20 Acute bronchitis | 19.9 | 3.2 (1.9 to 5.4) | |||
| G47 Sleep disorders | 4.0 | 3.0 (1.0 to 8.6) | |||
| I80 Phlebitis and thrombophlebitis | 4.6 | 2.8 (1.0 to 7.2) | |||
| M53 Dorsopathy | 5.3 | 2.6 (1.0 to 6.6) | |||
aOdds ratio calculated between cases and controls. Diagnostic codes with OR <1.5 are omitted. bP<0.05. COPD = chronic obstructive pulmonary disease.