Comparison of respondents, non-respondents, and those not contacted in the pre-CLT group
| Respondents (n = 79) | Non-respondents (n = 38) | Difference in proportions (respondents v non-respondents) | p Value | Not contacted (n = 30) | Difference in proportions (respondents v not-contacted) | p Value | |
|---|---|---|---|---|---|---|---|
| % (N) | % (N) | (95% CI) | % (N) | (95% CI) | |||
| *Comparing white with all other ethnic groups using the UK Office for National Statistics classification.18 | |||||||
| Severity | |||||||
| Severe | 29 (22) | 18 (7) | 11 (6 to 25) | 0.34 | 33 (10) | 4 (−15, 19) | 0.98 |
| Moderate | 39 (30) | 41 (16) | 3 (−16 to 22) | 0.90 | 27 (8) | 12 (1 to 34) | 0.09 |
| Mild | 32 (25) | 41 (16) | 9 (−9 to 28) | 0.42 | 40 (12) | 8 (−17 to 19) | 0.91 |
| Parent’s language | |||||||
| English | 97 (75) | 61 (19) | 36 (19 to 54) | 0.00001 | 90 (18) | 7 (−6 to 21) | 0.40 |
| Other | 3 (2) | 39 (12) | 10 (2) | ||||
| Visual impairment in the family | |||||||
| Yes | 24 (17) | 32 (11) | 8 (−11 to 27) | 0.53 | 46 (10) | 22 (−2 to 44) | 0.10 |
| No | 76 (53) | 68 (23) | 54 (12) | ||||
| Complexity of condition | |||||||
| Visual impairment alone | 49 (38) | 59 (17) | 10 (−11 to 30) | 0.53 | 53 (16) | 4 (−17 to 25) | 0.88 |
| Additional systemic problems | 51 (39) | 41 (12) | 47 (14) | ||||
| Ethnicity* | |||||||
| White | 91 (70) | 75 (29) | 16 (1 to 30) | 0.05 | 82 (18) | 9 (8–26) | 0.42 |
| Non-white | 9 (7) | 25 (9) | 18 (4) | ||||
| Deprivation (population quintiles) | |||||||
| 1st, 2nd, 3rd quintile | 73 (32) | 44 (11) | 29 (1 to 47) | 0.08 | 55 (6) | 18 (−18 to 46) | 0.62 |
| 4th, 5th quintile | 27 (15) | 56 (14) | 45 (5) | ||||
| Deprivation index | |||||||
| Mean | −0.52 | 1.23 | t = −2.90 | 0.005 | 1.58 | t = −1.80 | 0.07 |
| SD | 3.07 | 3.12 | 3.31 | ||||
| Age of child | |||||||
| Mean | 2.48 | 3.80 | t = −3.66 | 0.00004 | 2.75 | t = −.71 | 0.47 |
| SD | 1.78 | 1.96 | 1.78 | ||||