Age at confirmation of PCHI | ||||||||
No | Group mean* z score‡ (SD) | Unadjusted* mean difference (95% CI) | p Value | Adjusted† mean difference (95% CI) | p Value | |||
⩽9 months | >9 months | ⩽9 months | >9 months | |||||
WORD reading ability | ||||||||
Basic reading (x) | 45 | 57 | −0.54 (1.18) | −1.02 (1.24) | 0.45 (−0.03 to 0.93) | 0.064 | 0.55 (0.17 to 0.93) | 0.005 |
Reading comprehension (y) | 43 | 55 | −0.71 (1.18) | −1.09 (1.16) | 0.38 (−0.10 to 0.85) | 0.12 | 0.48 (0.09 to 0.86) | 0.016 |
Aggregate (x + y)/2 | 45 | 57 | −0.65 (1.14) | −1.10 (1.21) | 0.43 (−0.04 to 0.89) | 0.07 | 0.51 (0.15 to 0.87) | 0.006 |
VABS communication scale | 44 | 54 | −0.13 (1.16) | −0.65 (1.33) | 0.53 (0.02 to 1.03) | 0.042 | 0.56 (0.12 to 1.00) | 0.013 |
*Adjusted only for age at assessment.
†Adjusted, in a linear regression model, for severity of PCHI, maternal educational qualifications and Ravens Coloured Progressive Matrices (non-verbal ability) score.
‡Negative scores indicate that scores were lower than those seen in the normally hearing comparison group.1
VABS, Vineland Adaptive Behaviour Scales; WORD, Weschler Objective Reading Dimensions.