An Early Lexical Screening Tool for British English: Psychometric Properties and Clinical Utility.
Allegra Cattani, Dora Bianchi, Caroline Floccia
Most children with language difficulties were caught, but some children without difficulties were also flagged.
The tool gives SLTs sex-specific cut-off scores for direct vocabulary screening of 19–36-month-old British English toddlers.
Key findings
1Both the comprehension and production tasks showed excellent internal consistency (Cronbach's α = 0.87) and significant positive correlations with the PLS-4 reference standard, with medium-to-large effect sizes.
2Girls outperformed boys in both comprehension and production after controlling for age and parental education, and the test predicted PLS-4 scores equally well for both sexes.
3At the optimal 15th-percentile cut-off, sensitivity was 0.88 for comprehension and 0.89 for production, while specificity was 0.67 for both; the positive predictive value was 40% (comprehension) and 43% (production).
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What it does not show
The diagnostic accuracy analyses rest on a subsample of only 85 (comprehension) and 81 (production) children, so confidence intervals around sensitivity and specificity are wide. The sample was skewed toward higher parental education (63.5% held a degree or above), so the tool's performance in less advantaged families is untested. The production task was difficult for the youngest children (19–24 months), with many floor-level scores and exclusions for non-cooperation; the authors recommend it only for children over 24 months. The PLS-4 was used as the reference standard, but it is a broad language measure rather than a vocabulary-specific one, so the concurrent validity evidence is indirect for lexical skills. The broad age range (19–36 months) and high variability in early language development limit the precision of the cut-off scores, particularly at the lower and upper ends.
Declared interests
The authors declare no conflicts of interest. Funding was provided by Sapienza Università di Roma and the British Academy / Leverhulme.
The easy way to misread this
Do not read the high sensitivity as proof the tool is definitive. Specificity is 0.67 for both tasks, meaning a meaningful proportion of children flagged as at-risk will not actually have language difficulties. The authors themselves state the tool is for screening and referral, not diagnosis, and the positive predictive value is only 40–43% in this sample, so a low score should prompt further assessment rather than a label.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →