The combination of PPVT(TM)-5 and EVT(TM)-3 provides an accurate picture of receptive and expressive language ability for professionals completing screening and comprehensive diagnostic evaluations for language, reading, and cognitive skills. Studies have shown that as many as 14.9 percent of children have some level of hearing impairment. A child who uses assistive technology such as cochlear implants may be able to hear the speech sounds, but may still have difficulty discriminating between some of them. The child may also communicate primarily through other methods, creating variability in test results. Learn the other factors involved in their level of language vocabulary ability and their impact on test results.