The Norm Revision Of H-NTLA And Intelligence Comparing Study Of Children From 3 To 7 Years Old In China

ObjectivObjective:To revise the H-NTLA norm of hearing-impaired children and hearing-normalchildren in china the second time. To compare the intelligence difference between the hearing-impaired and the hearing-normal by studying the intelligence characteristics of deaf childrenof China in order to provide scientific evidence for reasonable recovery strategy.Methods:1.Sampling method:Sampling was chosen from 13 provinces of 6 administration districts. Therange of each age group was half year from 3 to 7 years old. It was designed to have 26sampling points in the city and countryside, 60 children in each sampling point (male: female1:1, city: countryside 1:1).2.Testing progress:To invest the intelligence 760 deaf children and 776 hearings of 13provinces in china; to test all of them by H-NTLA(Bead Patterns, Memory for Color, PictureIdentification, Picture Association, Paper Folding, Visual Attention Span, Block Patterns andCompletion of Drawings).Convert the H-NTLA children'score tolearning age, get the medianage, then we have children'IQ(IQ=(LA or MA\CA)×100).3. Statistical method:(1) The norm:To list the past rate and the original score ( x±s) of the hearing-impairedchildren and hearing-normal children.The age of the past rate which is between 50 percent and70 percent correponds to the learning age of the subtest.Sometimes,the learning age of the pastrate corresponds more than one, then take a small standard deviation as the norm.(2) Deviation intelligence quotient (DIQ) conversion table: to calculate the intelligencequotient (IQ) according to the new norm, then mark it into DIQ, fitting a linear regression curveof IQ and DIQ, a DIQ conversion tables developed.(3) The investigation refer to children'norm nationwide of 1994, involving all theintelligence quotient for ratio.The statistical methods are T-test,simple linear regression.Results1. The norm revision(1) The norm of the hearing-impaired children: The learning age of the same original scoreof Bead Patterns, Memory for Color, Picture Identification, Picture Association, VisualAttention Span, Block Patterns is earlier than the old norm, Paper Folding is later andCompletion of Drawings is near to the old one. (2) The norm of the hearing-normal children: The learning age of the same original score ofBead Patterns, Memory for Color, Picture Identification, Picture Association is earlier than theold norm,Paper Folding and Completion of Drawings is later,Visual Attention Span, BlockPatterns are near to the old one.(3) Item analisis:There are sub-items of the 8 sub-test,the sub-tests whose sub-item'orderwe need to revise are Picture Association, Paper Folding and Completion of Drawings.Thedifficulty index was from 0.3 to 0.7;The discrimination index was above 0.3;(4) The study of the reliability and the validity: The scorers'reliability were above 0.98;The test-retest reliability and Cronbach's coefficient were 0.817 and 0.715 respectively; Therewere all statistically significance among the sub-tests and the oral IQ; All the sub-tests was inhigh load on the common factor(>0.4); The cumulative proportion of variance of the commonfactor is more than 40％。The correlation coefficient of the test scores of hearing-impairedchildren and normal-hearing children with the Neuropsychological Development of Children'Diagnostic Scale were 0.557 and 0.517.2. The intelligence comparing study of hearing-normal children and hearing-impairedchildren(1)The intelligence comparing study of the hearing-normal children and hearing-normalchildren:The total IQ of children with hearing impairment aged 3-7 years old is higher than theIQ 15 years ago, but is 14 significantly lower than children with hearing normal today(t=14.72,P=0.000);The children with hearing impairment'IQ level is 2 months lower thanthan children with hearing normal in 3-4 years old, with the increasing age, the gap increases to18 months in 7 years old.(2)The intelligence construct comparing study of the hearing-normal children andhearing-normal children: The intelligence construct of the hearing-impaired children of thefive age groups (3 years old group, 4 years old group, 5 years old group, 6 years old group and7 years old group) are in balance,and the hearing-normal children's are also in balance exceptthe 4years old group.Comparing to the children with hearing normal, the children with hearingimpaired' s hand-eye coordination and accompanying memory develop well, imagery thinkingand spatial perception is slightly slow, but the abstract thinking, color memory and integratedcapacity obviously lagged behind.ConclusioConclusionThe sample is from 13 provinces by stratified cluster sampling .The average IQ are about100 in different age ,gender ,city and countryside, up to the standard requirements of thecrowd .And the intelligence of the two groups are normally distributed, also confirmed that thesample population with good representation.The norm revised is suitable for the children'intelligence development at present. The scale can be widely used because of moderate difficulty, good discrimination and favorable validity and reliability.The intelligence development of the children with hearing impairment in China still fallbehind the children with hearing normal,but the disdance is reducing. The society and the familyshould strengthen the early intervention and mental health education for the children withhearing impairment; The rehabilitation organization should further explored effective measuresto enhance the long-term effects.