Table 4 Prevalence of lens opacities in population-based studies reporting a similar age group.
From: Prevalence and risk factors of pre-senile lens opacities in the 1969-73 Vellore Birth Cohort
WHO Region | Country | Year | Age group (years) | Sample size | Rural/urban residence | LO grading system a | Prevalence (%)(95% CI) | Commonest type of LO |
|---|---|---|---|---|---|---|---|---|
The Americas | USA(25) | 2003 | 40-49 | 2363 | Urban | LOCS II (2/2/2) | 3 (2.3-3.7) | CO (1.7%) |
European | Italy (26) | 1995 | 40-49 | 278 | Urban | LOCS II (2/2/2) | 4 (2.8–5.1) | N (1.5%) |
African | Tanzania (27) | 2001 | 40-49 | 1339 | Rural | WHO simplified grading system | 4.5 (3.4-5.6) | CO (2.4%) |
The Americas | Barbados (28) | 1996 | 40-49 | 1333 | b | LOCS II (2/2/2) | 4.7 | CO (3.9%) |
Western Pacific | China (29) | 2012 | 45-49 | 1917 | Rural | LOCSIII (2/2/2) | 5.9 (4.9-7) | CO (3.5%) |
South-East Asian | Myanmar (30) | 2007 | 40-49 | 657 | Rural | LOCS III (4/2/2) | 6.1 (4.3-7) | NO (2.4%) |
Western Pacific | Singaporean Malay(31) | 2004–06 | 40-49 | 813 | Urban | WISCONSIN | 6.2 (4.5-7.9) | CO (4.2%) |
Western Pacific | Singaporean Chinese(32) | 1997-8 | 40-49 | 270 | b | LOCS III (4/2/2) | 7.0 | CO (3.0%) |
South-East Asian | Sri Lanka (33) | 2006-7 | 40-49 | 331 | Rural | LOCS III (4/2/2) | 9.4 (6.3-12.5) | c |
Eastern Mediterranean | Pakistan (34) | 2007 | 40-49 | 3567 | Urban /Rural | Mehra Minassian | 10.6 (9.6-11.7) | c |
South-East Asian | India, Vellore | 2014 | 41-45 | 1075 | Rural/urban | LOCSIII (>2/2/2) | 13.8 (11.8–16.0) | N (8.2%) |
South-East Asian | India, Madurai (35) | 1995-7 | 40-49 | 2061 | Rural | LOCS III (3/3/2) | 15.7 (14.1-17.3) | NO (8.2%) |
South-East Asian | Indonesia (36) | 2003 | 40-49 | 198 | Rural | LOCS III (4/4/2) | 24.3 (0-100) | Mixed 16% |
