Table 2. Persons affected by the most frequently co-occurring pairs of chronic diseases and their observed and expected prevalence per 100 population.

Frequent co-occurring pairs	n	Prevalence/100			Chi2 (p value)B	Odds Ratio (from Logistic regression) (95% CI)
		Observed	ExpectedA	Observed/Expected		Crude	Adjusted
HBP and Arthritis	826	18.05	15.62	1.16	9.8 (<0.01)	1.5 (1.4–1.7)	1.4 (1.2–1.6)
HBP and Cancer	401	8.77	8.49	1.03	0.2 (0.63)	1.1 (0.9–1.2)	0.9 (0.8–1.1)
HBP and Heart disease	381	8.33	7.08	1.18	5.0 (0.02)	1.5 (1.2–1.7)	1.1 (0.9–1.3)
Asthma/hayfever and arthritis	367	8.02	5.90	1.36	15.9 (<0.01)	1.9 (1.6–2.2)	1.6 (1.4–1.9)
HBP and Diabetes	365	7.98	5.51	1.45	22.2 (<0.01)	2.5 (2.1–3.1)	2.4 (2.0–2.9)
HBP and Asthma/hayfever	348	7.61	7.56	1.01	0.01 (0.94)	1.0 (0.9–1.2)	1.0 (0.8–1.2)
Cancer and Arthritis	319	6.97	6.62	1.05	0.44 (0.51)	1.1 (0.9–1.3)	1.0 (0.8–1.2)
Arthritis and DepressionC	307	6.71	4.77	1.41	16.0 (<0.01)	2.0 (1.7–2.4)	1.9 (1.6–2.3)
HBP and DepressionC	304	6.65	6.11	1.09	1.1 (0.28)	1.2 (1.0–1.4)	1.2 (1.0–1.5)
Heart disease and Arthritis	284	6.21	5.51	1.13	2.0 (0.15)	1.2 (1.1–1.5)	1.1 (0.9–1.3)
Arthritis and Osteoporosis	257	5.62	4.05	1.39	12.3 (<0.01)	1.9 (1.6–2.3)	1.3 (1.1–1.6)

^A Multiplication of observed prevalences of individual disease;

^B Test of independence for observed and expected prevalences;

^C including anxiety.