Table 4.

Relative risk of being recorded in CPHR (the primary care database) 0-365 days after symptom scores in later study compared to earlier study for those scoring above cut-off

		Found in CPHR (unadjusted)			Found in CPHR (adjusted a)
	Ref	RR	95%CI	p-value	RR	95%CI	p-value
Tromsø
Later study	Earlier study = 1 (ref)	0.99	(0.80–1.22)	0.927	1.12	(0.91–1.37)	0.289
HUNT
Later study	Earlier study = 1 (ref)	0.98	(0.88–1.08)	0.635	1.11	(1.00-1.22)	0.050

Abbreviations: CPHR: Norwegian Control and Payment of Health Reimbursements Database; RR: Relative risk; HUNT: Health Survey of Nord-Trøndelag County

a) adjusted for HSCL/HADS score (continuous), age (continuous; 40–79 years of age in Tromsø and 20–79 years of age in HUNT), sex, education (3 levels), and income quartile