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Table 2 Prevalence rates of VI, correctable VI and noncorrectable VI for two criteria by age, sex, insurance, occupation and education*

From: Visual impairment and spectacle coverage rate in Baoshan district, China: population-based study

Characteristic Presenting visual acuity for a 6/18 cutoff Presenting visual acuity for a 6/12 cutoff
  VI n(%;95%CI) Correctable VI n(%;95%CI) Noncorrectable VI n(%;95%CI) VI n(%;95%CI) Correctable VI n(%;95%CI) Noncorrectable VI n(%;95%CI)
Age,y       
60-69 159(5.47;4.64-6.30) 124(4.27;3.53-5.00) 35(1.20;0.81-1.60) 370(12.73;11.52-13.94) 274(9.43;8.36-10.49) 96(3.30;2.65-3.95)
70-79 118(10.70;8.87-12.52) 82(7.43;5.89-8.98) 36(3.26;2.22-4.31) 319(28.92;26.25-31.60) 196(17.77;15.51-20.03) 123(11.15;9.29-13.01)
80~ 124(23.18;19.60-26.75) 58(10.84;8.21-13.48) 66(12.34;9.55-15.12) 284(53.08;48.86-57.31) 129(24.11;20.49-27.74) 155(28.97;25.13-32.82)
total 401(8.82;8.00-9.65) 264(5.81;5.13-6.49) 137(3.01;2.52-3.51) 973(21.41;20.22-22.60) 599(13.18;12.20-14.16) 374(8.23;7.43-9.03)
Age adjusted 9.53(8.18-10.39) 6.22(5.52-6.93) 3.31(2.79-3.83) 23.55(22.32-24.79) 14.26(13.25-15.28) 9.30(8.45-10.14)
Gender       
Male 134(7.02;5.87-8.16) 89(4.66;3.71-5.60) 45(2.36;1.68-3.04) 319(16.70;15.03-18.37) 207(10.84;9.44-12.23) 112(5.86;4.81-6.92)
Female 267(10.13;8.98-11.29) 175(6.64;5.69-7.59) 92(3.49;2.79-4.19) 654(24.82;23.17-26.50) 392(14.88;13.52-16.24) 262(9.94;8.80-11.09)
Type of insurance       
No insurance 2(10.00;1.00-32.00) 2(10.00;1.00-32.00) 0(0;0–17.00) 4(20.00;6.00-44.00) 3(15.00;3.00-38.00) 1(5.00;0–25.00)
Urban insurance 219(9.64;8.43-10.86) 149(6.56;5.54-7.58) 70(3.08;2.37-3.79) 503(22.15;20.44-23.86) 306(13.47;12.07-14.88) 197(8.67;7.52-9.83)
Others 180(7.99;6.87-9.10) 113(5.01;4.11-5.91) 67(2.97;2.27-3.67) 466(20.67;19.00-22.35) 290(12.87;11.48-14.25) 176(7.81;6.70-8.92)
Occupation       
Peasant 89(7.22;5.78-8.67) 59(4.79;3.60-5.98) 30(2.44;1.57-3.30) 245(19.89;17.66-22.12) 156(12.66;10.81-14.52) 89(7.22;5.78-8.67)
Non-peasant 312(9.42;8.42-10.41) 205(6.19;5.37-7.01) 107(3.23;2.63-3.83) 728(21.97;20.56-23.38) 443(13.37;12.21-14.53) 285(8.60;7.65-9.56)
Level of Education       
Illiteracy 104(15.20;12.51-17.90) 55(8.04;6.00-10.08) 49(7.16;5.23-9.10) 253(36.99;33.37-40.61) 128(18.71;15.79-21.64) 125(18.27;15.38-21.17)
Primary school 200(8.62;7.48-9.77) 137(5.91;4.95-6.87) 63(2.72;2.06-3.38) 480(20.70;19.05-22.35) 304(13.11;11.74-14.48) 176(7.59;6.51-8.67)
Secondary school or higher 97(6.29;5.08-7.50) 72(4.67;3.62-5.72) 25(1.62;0.99-2.25) 240(15.56;13.75-17.37) 167(10.83;9.28-12.38) 73(4.73;3.67-5.79)
  1. *Data are given as numbers of persons (prevalence percentage; 95% confidence interval).
  2. Age adjusted to the 2000 Shanghai census population. Data are given as prevalence percentage (95% confidence interval).