[Intelligence study on 1758 deaf children in China].

In order to determine the character of mental development and the influencing factors of childhood deafness in China the revised H-NTLA was applied to 1758 deaf children within the age range of 3 to 17 years. Compared with 1788 normal hearing children, the results showed that (1) the deaf children were about 20 points lower in IQ than those with normal hearing; (2) the average retardation was found to be about 6 months in 3-5 years old age, the difference became significant from 6 years old, the average retardation was found to be 36 months during 13 years old; (3) the scores were the same as those of the normal hearing children for block patterns, paper folding and puzzle blocks in 3-9 age groups; for visual attention span and spatial reasoning in 16-17 age groups. The scores were retarded significantly on picture association, picture analogies, memory for color and digits; (4) the influencing factors were found with stepwise regression model to be audiphone wearing, education fee and the beginning age of education.