Table 9.
Distribution by type of disorder in the 179 patients with at least one comorbidity and comparison between chronic and episodic headache patients (some patients suffered from more than one comorbidity at the same time)
| Comorbidity type | Total (n = 179), n (%) | Episodic headache (n = 98), n (%) | Chronic headache (n = 81), n (%) | OR [95% CI]a | P valueb |
|---|---|---|---|---|---|
| Gastrointestinal | 55/179 (30.7) | 21/98 (21.4) | 34/81 (42.0) | 2.65 [1.35–5.20] | 0.0031 |
| Endocrinological | 51/179 (28.5) | 31/98 (31.6) | 20/81 (24.7) | 0.71 [0.36–1.38] | 0.3072 |
| Rheumatological | 51/179 (28.5) | 19/98 (19.4) | 32/81 (39.5) | 2.72 [1.36–5.41] | 0.0031 |
| Psychiatric | 40/179 (22.3) | 18/98 (18.4) | 22/81 (27.2) | 1.66 [0.81–3.38] | 0.1610 |
| Cardiological | 32/179 (17.9) | 14/98 (14.3) | 18/81 (22.2) | 1.71 [0.79–3.73] | 0.1690 |
| Respiratory | 17/179 (9.5) | 15/98 (15.3) | 2/81 (2.5) | 0.14 [0.03–0.66] | 0.0036 |
| Urological | 12/179 (6.7) | 7/98 (7.1) | 5/81 (6.2) | 0.86 [0.26–2.81] | 0.7967 |
| Haematological | 11/179 (6.1) | 7/98 (7.1) | 4/81 (4.9) | 0.68 [0.19–2.41] | 0.5421 |
| Obstetric-gynaecological | 6/179 (3.4) | 5/98 (5.1) | 1/81 (1.2) | 0.23 [0.03–2.07] | 0.1536 |
| Neurological | 1/179 (0.6) | 0/98 (0.0) | 1/81 (1.2) | ∞ | 0.2714 |
CI confidence interval, OR odds ratio
achronic vs episodic headache OR
bp value is derived from a Chi square test for homogeneity of odds