Table 1 Clinical-etiological classification of 849 participants with ID, Florianópolis macroregion, Brazil, 2011–2014

Idiopathic (61.4%)

Idiopathic ID (40.40%)

Unspecific

12

1.4%

6

6

Mild

24

2.8%

12

12

Moderate

263

31%

119

144

Severe

44

5.2%

19

25

Autism Spectrum Disorders (14.13%)

Autism

115

13.6%

26

89

Asperger Syndrome

5

0.6%

1

4

Other Brain Disorders (6.83%)

Developmental Delay

21

2.5%

9

12

Global Developmental Delay

7

0.8%

0

7

Chronic Encephalopaty

2

0.2%

0

2

Multiple Deficiency

22

2.6%

12

10

Epilepsy

6

0.7%

2

4

Cerebral Palsy (11.8%)

Cerebral Palsy

100

11.8%

44

56

Known Conditions of Uncertain Etiology (2.6%)

Agenesis of the Corpus Callosum

2

0.2%

1

1

Hydrocephalus

1

0.1%

1

0

Hypomelanosis of Ito

1

0.1%

1

0

Microcephaly

4

0.5%

2

2

Arnold Chiari Syndrome

1

0.1%

1

0

Dandy Walker Syndrome

1

0.1%

0

1

Dubowitz Syndrome

1

0.1%

0

1

Lennox-Gastaut Syndrome

2

0.2%

2

0

West Syndrome

9

1%

3

6

Infectious Diseases (6.1%)

Cytomegalovirus

3

0.4%

2

1

Meningitis

31

3.7%

16

15

Rubella (German measles)

10

1.2%

7

3

Measles

2

0.2%

1

1

Toxoplasmosis

6

0.7%

4

2

Trisomy 21 (13.7%)

Down syndrome

116

13.7%

45

71

Other Chromosomal Alterations (0.9%)

Structural or Numerical

8

0.9%

4

4

Microdeletion and Microduplication Syndromes (0.7%)

Cri-du-chat Syndrome

1

0.1%

1

0

Prader-Willi Syndrome

4

0.5%

1

3

Williams syndrome

1

0.1%

0

1

Monogenic Causes (2.8%)

Tuberous Sclerosis

1

0.1%

1

0

Angelman Syndrome

5

0.6%

3

2

Allan-Herndon-Dudley Syndrome

1

0.1%

0

1

Cohen Syndrome

1

0.1%

0

1

Cornelia de Lange Syndrome

2

0.2%

2

0

Gorlin-Goltz Syndrome

1

0.1%

0

1

Kabuki Syndrome

3

0.4%

0

3

Marinesco-Sjogren Syndrome

2

0.2%

1

1

Fragile X Syndrome

4

0.5%

1

3

Rett Syndrome

4

0.5%

4

0

Total

–

849

100%

354

495