Home language environment in relation to language outcome in Brazilian toddlers who are hard of hearing and controls with typical hearing - a pilot study including reliability analyses of the LENA recording system.

Abstract

The purpose of this pilot study was to explore the home language environment and language outcome of Brazilian toddlers who were hard of hearing, (HH) and controls with typical hearing (TH), and investigate the reliability of using the LENA recording system within a Brazilian Portuguese context. Fourteen families participated in the study (seven children who were HH and seven controls with TH. Each family contributed with one all-day recording. A smaller portion of the recordings of the typically hearing toddlers were manually transcribed by two transcribers. An interrater agreement was conducted, and then the human transcript results were compared against the LENA-generated data for three measures: Adult Words (AW), Child Vocalizations (CV) and Conversational Turns (CT). Data analyses revealed a moderate to strong interrater agreement for CV and AW. Weak to moderate agreement was found between the LENA estimates and the means of the human counts for CV and AW. Seemingly, LENA overestimated human counts for AW and underestimated numbers of CV. Comparative analysis suggested similarities in the language and listening environment of the two groups (TH vs. HoH). Children's language development was supported by higher numbers of parent-child interactions (CT). The findings imply that LENA may contribute as an ecologically valid tool in preventive family-centered intervention programs for Brazilian toddlers who are hard of hearing and their families, although further validation studies are needed.