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采用瑞文测验法对包头市１０２名在校聋哑儿童智力水平及听力丧失对智力发育的影响进行了调查，智力低下（ＩＱ＜７０）者达１３．７２％，平均智商与正常听力儿童相比差异均有统计学意义。听力丧失对智力发育有很大影响。
The influence of intelligence level and hearing loss on mental development of 102 deaf-mute children in Baotou was investigated by Raven test. The average IQ and normal hearing children were 13.72% with IQ <70, The differences were statistically significant. Hearing loss has a great impact on mental development.