Korean J Ophthalmol Vol.25, No.6, 2011 Table 7. Prevalence of pterygium according to age and gender Age group (yr) Total 19-29 30-39 40-49 50-59 60-69 ≥70 No 11,014 1,543 2,130 2,192 1,845 1,780 1,524 Total Prev (%) 5.4 0.1 0.9 3.9 7.2 13.6 18.9 SE (0.3) (0.1) (0.2) (0.6) (0.9) (1.0) (1.3) No 4,716 685 896 943 797 773 622 Male Prev (%) 6.1 0.1 1.5 5.0 9.6 14.9 21.8 SE (0.5) (0.1) (0.4) (0.9) (1.5) (1.6) (2.2) No = number of participants; Prev = prevalence; SE = standard error. No 6,298 858 1,234 1,249 1,048 1,007 902 Female Prev (%) 4.7 0.0 0.3 2.8 4.8 12.5 17.1 SE (0.3) (0.0) (0.1) (0.6) (0.7) (1.4) (1.5) p-value <0.01 - <0.01 0.03 <0.01 0.07 0.07 Fig. 4. Prevalence of pterygium accord- ing to age and gender. Table 8. Prevalence of age-related macular degeneration according to age and gender Age group (yr) Total 40-49 50-59 60-69 ≥70 Early AMD Total Male Female No P(%rev) SE No P(%rev) SE No P(%rev) SE 6,453 5.1 (0.3) 2,737 5.2 (0.5) 3,716 5.0 (0.4) 2,071 1.6 (0.3) 885 1.9 (0.5) 1,186 1.2 (0.4) 1,706 4.1 (0.5) 737 4.7 (0.9) 969 3.5 (0.6) 1,527 8.8 (0.9) 660 9.6 (1.4) 867 8.1 (1.1) 1,149 13.6 (1.2) 455 13.3 (1.8) 694 13.8 (1.5) p-value 0.76 0.23 0.31 0.42 0.82 Late AMD Total Male Female No P(%re)v SE No P(%rev) SE No P(%re)v SE 6,453 0.5 (0.1) 2,737 0.6 (0.2) 3,716 0.4 (0.1) 2,071 0.3 (0.1) 885 0.5 (0.3) 1,186 0.0 (-) 1,706 0.1 (0.1) 737 0.2 (0.2) 969 0.0 (-) 1,527 0.9 (0.3) 660 0.8 (0.3) 867 0.9 (0.5) 1,149 1.5 (0.4) 455 1.9 (0.7) 694 1.3 (0.4) p-value 0.19 - 0.14 0.84 0.38 Patients were defined as having early AMD if they met any one of the following criteria: 1) the presence of soft indistinct drusen or reticular drusen or, 2) the presence of hard or soft distinct drusen with pigmentary abnormalities (increased pigmentation or hypopigmentation of the retinal pigment epithelium) in the absence of signs of late AMD. AMD = age-relaged macular degeneration; No. = numberof participants; Prev = prevalence; SE = standard error. Fig. 5. Prevalence of early and late age-related macular degeneration ac- cording to age and gender. males, 14.8 ± 1.1% in females). The prevalence of pterygium increased with age (p < 0.01). The prevalence of pterygium in participants over 40 years of age was higher in males than females (p < 0.01). 428