Respondent characteristics in the 1999 and 2013 survey groups
| Variables | 1999 sample (n=1187) | 2013 sample (n=1169)† | Statistic, p value, effect size and n |
|---|---|---|---|
| Gender | |||
| Male | 368 (31.0%) | 358 (30.6%) | χ2 (1)=0.04, p=0.84: n=2356 |
| Female | 819 (69.0%) | 811 (69.4%) | |
| Age at survey completion (years) | |||
| Mean (SD) | 78.34 (7.10) | 80.15 (7.99) | t (2313.83)=−5.79, p<0.001***: r=−0.02, n=2356 |
| Median | 78.66 | 81.00 | |
| Registration status | |||
| Not registered | 469 (39.5%) | 790 (67.6%) | χ2 (2)=206.53, p<0.001***: Cramer's V=0.30, n=2356 |
| Registered sight impaired (SI)/partially sighted | 379 (31.9%) | 256 (21.9%) | |
| Registered severely sight impaired (SSI)/blind | 339 (28.6%) | 123 (10.5%) | |
| Number of eyes affected | |||
| One eye | 223 (18.8%) | 226 (19.3%) | χ2 (1)=0.11, p=0.74: n=2356 |
| Both eyes | 964 (81.2%) | 943 (80.7%) | |
| Years since diagnosis‡ | |||
| Mean (SD) | 5.91 (4.92) | 5.55 (3.77) | U=635, 839.00, z=0.30, p=0.77: n=2249 |
| Median | 5.00 | 5.00 | |
Values are frequencies (valid percentage %) unless otherwise stated.
*p<0.05; **p<0.01; ***p<0.001.
†The majority of the 2013 survey respondents self-reported their ethnicity as ‘white’ (99.5%). No question on ethnicity was included in the 1999 survey.
‡For information. Not included in further analyses.