Follow-up study on health care use of patients with somatoform, anxiety and depressive disorders in primary care

BMC Primary Care

Table 3 Predictors for FP-consultation rate (incidence rate ratios (IRRs) from multivariate Poisson regression models^##).

	FP consultation
	IRR	95% CI
Model 1 ^#
Undifferentiated somatoform disorders ^$	* 1.3	(1.1–1.7)
Other somatoform disorders ^$$	1.3	(0.7–2.2)
Depressive disorders	1.5	(1.0–2.3)
Anxiety disorders	0.9	(0.7–1.4)
CIRS somatic morbidity score
- low score (<5)	1.0	reference
- intermediate score (5–8)	1.2	(1.0–1.5)
- high score (≥ 9)	** 1.6	(1.3–1.9)
Model 2 ^@
Psychiatric disorders
- none of the psychiatric disorders (n = 274)	1.0	reference
- a single disorder (n = 91)	* 1.3	(1.1–1.6)
- two or more disorders (n = 35)	* 1.7	(1.2–2.5)
CIRS somatic morbidity score
- low score (<5)	1.0	reference
- intermediate score (5–8)	1.2	0.9–1.6
- high score (≥ 9)	** 1.6	1.3–1.9

^## All models were additionally adjusted for the sampling scheme and for patients' age and gender and the number of unique somatic prescriptions in year prior to follow-up.
^$ Undifferentiated somatoform disorders included chronic pain disorders.
^$$ Other somatoform disorders: hypochondriasis, somatization disorder and conversion disorder.
^# Model 1: reference groups are patients without a disorder in the specified diagnostic group (including patients without any of the psychiatric disorders).
^@ Model 2: reference groups are patients without any of the specified disorders; a single disorder = a somatoform or depressive or anxiety disorder; two or more disorders = a somatoform disorder with co-morbid anxiety or depressive disorder, or anxiety disorder with co-morbid depressive disorder.
* p ≤ 0.05; ** p ≤ 0.005

ISSN: 2731-4553