Table 7.

Relationship between reading written IC with age and education level of patients and Mantel-Haenszel test (M.H)

		Yes/Total	Reading %
Age	>  60	50/155	32.2
	≤ 60	194/316	61.4
	Total	244/471	51.8
OR = 3.33 (CI 95%: 2.22–5.01) p = 0.000
Education	< High School	102/247	41.3
	≥ High School	142/224	63.4
	Total	244/471	51.8
OR = 2.46 (CI: 1.70–3.57) p = 0.000
Mantel-Haenszel test
Age > 60	Education
	< High School	30/112	26.8
	≥ High School	20/43	46.5
	Total	50/155	32.3
OR = 2.37 (CI 95%: 1.14–4.92) p = 0.001
Age ≤ 60	Education
	< High School	72/135	53.3
	≥ High School	122/181	67.4
	Total	194/316	61.4
OR = 1.81 (CI 95%: 1.14–2.86) p = 0.001

M.H. test stratified for age OR = 1.94 (C.I.1.32–2.90) p = 0.001