A screening on Specific Learning Disorders in an Italian speaking high genetic homogeneity area.
In a genetically isolated Italian town, one in 16 second-graders already meets SLD criteria—far above official counts.
01Research in Context
What this study did
Alonso Soriano et al. (2015) visited every second-grade classroom in a small Sardinian town. The area keeps family lines tight, so gene pools stay narrow.
They screened 610 children for reading, writing, and math troubles. No extra control group was needed; they just counted how many kids fit Italy’s SLD rules.
What they found
One in 16 pupils met criteria for a specific learning disorder. Dyslexia alone showed up in 4.75% of kids—higher than Italy’s national tally.
The rest had dyscalculia or mixed problems. The short report did not test an intervention, so we do not know if scores later improved.
How this fits with other research
Morales Hidalgo et al. (2021) and Morales-Hidalgo et al. (2018) used the same door-to-door school method in Spain. They found ASD in about 1.5% of pupils—far below the 6% SLD rate here. The numbers look opposite, but the teams hunted different disorders; both warn that official records miss many cases.
Delgado-Lobete et al. (2019) screened Spanish classrooms for suspected developmental coordination disorder and flagged 12%. That figure is double the Sardinian SLD rate, yet both studies blame under-referral, not real regional risk. The shared message: check the classroom, not the clinic list.
Whitehouse et al. (2014) counted mild intellectual disability in France at 1.8%. Sitting next to Claudia’s 6% SLD, the two rates add up to a simple takeaway—learning profiles vary, so broad screens must cover more than IQ.
Why it matters
If you assess in Italian schools, expect roughly one learner with SLD at every table of six. Use early-grade teacher checklists, not past district files, to spot them. Pair Claudia’s 6% base rate with Paula’s ASD findings and Laura’s DCD numbers—your caseload could top 15%. Plan group slots, train staff, and prep multi-skill lesson plans now.
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02At a glance
03Original abstract
The aim of the present research is to investigate the prevalence of Specific Learning Disorders (SLD) in Ogliastra, an area of the island of Sardinia, Italy. Having experienced centuries of isolation, Ogliastra has become a high genetic homogeneity area, and is considered particularly interesting for studies on different kinds of pathologies. Here we are going to describe the results of a screening carried out throughout 2 consecutive years in 49 second grade classes (24 considered in the first year and 25 in the second year of the study) of the Ogliastra region. A total of 610 pupils (average age 7.54 years; 293 female, 317 male) corresponding to 68.69% of all pupils who were attending second grade in the area, took part in the study. The tool used for the screening was "RSR-DSA. Questionnaire for the detection of learning difficulties and disorders", which allowed the identification of 83 subjects at risk (13.61% of the whole sample involved in the study). These subjects took part in an enhancement training program of about 6 months. After the program, pupils underwent assessment for reading, writing and calculation abilities, as well as cognitive assessment. According to the results of the assessment, the prevalence of SLDs is 6.06%. For what concerns dyslexia, 4.75% of the total sample manifested this disorder either in isolation or in comorbidity with other disorders. According to the first national epidemiological investigation carried out in Italy, the prevalence of dyslexia is 3.1-3.2%, which is lower than the prevalence obtained in the present study. Given the genetic basis of SLDs, this result, together with the presence of several cases of SLD in isolation (17.14%) and with a 3:1 ratio of males to females diagnosed with a SLD, was to be expected in a sample coming from a high genetic homogeneity area.
Research in developmental disabilities, 2015 · doi:10.1016/j.ridd.2015.07.011