Table 1.

Participant characteristics.

Characteristics	Cross-section I		Cross-section II
	n	%	n	%
Age (mean)	(66.2)		(66.7)
50–54	485	13.3	350	10.0
55–59	534	14.6	580	16.5
60–64	638	17.5	600	17.1
65–69	671	18.4	639	18.2
70–74	538	14.7	572	16.3
75–79	422	11.6	407	11.6
80–84	230	6.3	226	6.4
85–89	100	2.7	110	3.1
90+	36	1.0	24	0.7
Female	2072	56.7	1998	57.0
Ever Smokers	1784	51.2	1789	51.2
Use of inhaled steroids	370	10.94	478	13.8^
History of:
Diabetes	284	7.8	347	9.9^
Hypertension	1669	46.0	1825	52.2^
Emmetropia*	1558	42.9	1478	42.2
Myopia*	442	12.2	495	14.1^
Hyperopia*	1633	45.0	1532	43.7

n = number of persons affected

* best spherical equivalent refraction correction

^ P < 0.01