Table 2.

 AMD causing visual impairment associated with smoking by age

Age group	Odds ratio*	95% CI	p Value
75–79	2.89	1.40 to 5.94	0.003
80–84	1.85	1.09 to 3.15	0.022
85–89	1.38	0.69 to 2.78	0.361
90+	0.93	0.25 to3.44	0.915

Mantel-Haenszel estimate of the odds ratio controlling for the effects of age  =  1.78 (95% confidence intervals 1.26 to 2.52) p = 0.001.

*Odds of being a case if current smoker divided by odds of being a case if a non-smoker.