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Table 1 Structure of the HelSLI study: the schedule of enrolment, questionnaires and assessments

From: Understanding developmental language disorder - the Helsinki longitudinal SLI study (HelSLI): a study protocol

Timepoint Pre-study Onset Follow-ups
t00 t0 t1 t2 t3
Group Language Age at Onset Assessment
Informed consent Background information Genetic saliva sample Neuropsychological Speech and language therapist STM and AGL tablet tasks SDQ, ASEBA, CCC-2a Medical examination Clinical EEG ERP Video-taped play sessions Temperament questionnaire ALDeQ, ALEQb Speech and language therapist Speech and language therapist Speech and language therapist
DLD Monolingual 3 yrs    
4 yrs     
5 yrs     
6 yrs     
Bilingual 3 yrs    
4 yrs      
5 yrs       
6 yrs        
TD Monolingual 3 yrs       
4 yrs         
5 yrs          
6 yrs          
Bilingual 3 yrs      
4 yrs        
5 yrs         
6 yrs          
  1. DLD developmental language disorder, TD Typically developing
  2. Time points: t00 = enrolment; t0 = entering the study at age 3–6 years; t1, t2, t3 = yearly follow ups, last follow up at age 6. STM Short-term memory, AGL Artificial grammar learning, SDQ Strengths and difficulties questionnaire, ASEBA Achenbach System of Empirically Based Assessment, CCC-2 Children’s communication checklist, EEG Electroencephalography, ERP Event-related potential, ALDeQ Alberta Language Development Questionnaire, ALEQ Alberta Language Environment Questionnaire
  3. aMonolinguals: Parents and Kindergarten, Bilinguals: Kindergarten only
  4. bParent reports on first language development and language environment