AIM To assess spoken language comprehension in non-speaking children with severe cerebral palsy (CP) and to explore possible associations with motor type and disability.METHOD Eighty-seven non-speaking children (44 males, 43 females, mean age 6y 8mo, SD 2y 1mo) with spastic (54%) or dyskinetic (46%) CP (Gross Motor Function Classification System [GMFCS] levels IV [39%] and V [61%]) underwent spoken language comprehension assessment with the computer-based instrument for low motor language testing (C-BiLLT), a new and validated diagnostic instrument. A multiple linear regression model was used to investigate which variables explained the variation in C-BiLLT scores. Associations between spoken language comprehension abilities (expressed in z-score or age-equivalent score) and motor type of CP, GMFCS and Manual Ability Classification System (MACS) levels, gestational age, and epilepsy were analysed with Fisher's exact test. A p-value <0.05 was considered statistically significant.
RESULTSChronological age, motor type, and GMFCS classification explained 33% (R=0.577, R 2 =0.33) of the variance in spoken language comprehension. Of the children aged younger than 6 years 6 months, 52.4% of the children with dyskinetic CP attained comprehension scores within the average range (z-score ≥À1.6) as opposed to none of the children with spastic CP. Of the children aged older than 6 years 6 months, 32% of the children with dyskinetic CP reached the highest achievable age-equivalent score compared to 4% of the children with spastic CP. No significant difference in disability was found between CP-related variables (MACS levels, gestational age, epilepsy), with the exception of GMFCS which showed a significant difference in children aged younger than 6 years 6 months (p=0.043).INTERPRETATION Despite communication disabilities in children with severe CP, particularly in dyskinetic CP, spoken language comprehension may show no or only moderate delay. These findings emphasize the importance of introducing alternative and/or augmentative communication devices from early childhood.Cerebral palsy (CP), primarily a motor disorder, is often accompanied by a range of impairments including disabilities in communication. 1 It has been shown that the severity of motor impairment in CP (expressed in Gross Motor Function Classification System [GMFCS] level) 2 is related to the prevalence of disabilities in communication. [3][4][5] Indeed, disabilities in expressive and/or receptive communication are present in 50 to 75% of children with CP corresponding to GMFCS levels I to III, increasing to 100% in children with severe CP (corresponding to GMFCS levels IV and V). [3][4][5]7 The present study focuses on receptive communication abilities in children with CP with the most severe motor limitations (i.e. GMFCS levels IV and V).In clinical practice, different diagnostic tests are available to assess the comprehension of spoken language (for a review see Geytenbeek et al. 11 ). However, all these tests require motor action, such as manipulat...