Correlations between education, occupation, income, and housing type with ocular biometry and refraction
| Spearman rank correlation coefficient | ||||
|---|---|---|---|---|
| Education (years) | Occupation (others, near work) | Income, category | Housing type, category | |
| *Significant at p<0.05, **significant at p<0.01, ***significant at p<0.001. | ||||
| LOCS III: Lens Opacity Classification System III score (from 1 to 6). | ||||
| Education categories: no formal education, primary, secondary, tertiary. | ||||
| Occupation categories: near work occupations, others (refer to text for details of occupation categories). | ||||
| Income categories: $1000 or less, $1001–2000, $2001–3000, more than $3000. | ||||
| Housing type categories: 1 or 2 room government flats, 3 room government flats, 4 or 5 room government flats and private housing. | ||||
| There were 29 people with missing data on occupation (unclassifiable occupation), 104 with missing data on income (including 95 who had retired) and 5 with missing data on housing type. | ||||
| Age (years) | −0.44*** | −0.17*** | −0.47*** | −0.08** |
| Sex (men, women) | −0.26*** | −0.14*** | −0.33*** | 0.05 |
| Axial length (mm) | 0.35*** | 0.25*** | 0.31*** | 0.07* |
| Anterior chamber (mm) | 0.34*** | 0.19*** | 0.35*** | 0.09** |
| Lens thickness (mm) | −0.28*** | −0.14*** | −0.34*** | −0.08* |
| Vitreous chamber (mm) | 0.35*** | 0.24*** | 0.33*** | 0.06 |
| Corneal curvature radius (mm) | 0.07* | 0.06* | 0.13*** | 0.01 |
| Nuclear opacity, LOCS III | −0.34*** | −0.16*** | −0.36*** | −0.08* |
| Refraction (dioptres) | −0.30*** | −0.23*** | −0.25*** | −0.04 |