Comorbidity Cohort (2C) study: Cardiovascular disease severity and comorbid osteoarthritis in primary care

Table 2 2C baseline cohorts

Disease cohort	Cohort ID	Denominator cohort N = 9676 n	Responders cohort n = 5426 n* (%)	Non-responders cohort n = 4250 n* (%)	Linkage consenters cohort n = 4030 n** (%)
-CVD -OA	0	2535	1165 (45.9)	1370 (54.1)	820 (70.4)
+Hyp -OA	1	1322	720 (54.5)	602 (45.5)	525 (72.9)
+IHD -OA	2	2036	1196 (58.7)	840 (41.3)	915 (76.5)
+HF -OA	3	259	149 (57.5)	110 (42.5)	108 (72.5)
-CVD + OA	4	1317	828 (62.9)	489 (37.1)	617 (74.5)
+Hyp + OA	5	1644	1017 (61.9)	627 (38.1)	773 (76.0)
+IHD + OA	6	490	305 (62.2)	185 (37.8)	237 (77.8)
+HF + OA	7	73	46 (63.0)	27 (37.0)	35 (76.1)

CVD = Cardiovascular disease, OA = Osteoarthritis, Hyp = Hypertension, IHD = Ischaemic heart disease, HF = Heart failure.
Disease categories (defined by study specific Read codes in the 3 years prior to baseline survey.
-CVD -OA = no record of CVD (hypertension, IHD or HF) condition or OA; -CVD + OA = record of OA but not CVD (hypertension, IHD or HF).
+Hyp -OA = record of hypertension without OA; +IHD -OA = record of IHD without OA; +HF -OA = record of HF without OA.
+Hyp + OA = record of hypertension and OA; +IHD + OA = record of IHD and OA; +HF + OA = record of HF and OA.
*percentage of denominator population; **percentage of responder population.

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