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. Author manuscript; available in PMC: 2019 Oct 14.
Published in final edited form as: J Intellect Disabil Res. 2018 May 24;62(7):637–649. doi: 10.1111/jir.12503

Table 3.

Relationship between SIB and clinical variables at T4

At time 4 1. Without SIB 2. Low SIB 3. High SIB
N Median (IntQ*) N Median (IntQ*) N Median (IntQ*) P value Post hoc test (Bonferroni)
Autism severity (CARS total score) 66 28.7 (25;37) 17 38.5 (37;42) 19 44 (32;48.5) .0001 1 ≠ 2.3
N % N % N % P value
Best estimate DQ
 1. Severe intellectual disability (DQ < 40) 34 52.3 14 87.5 17 89.5 .004 1 ≠ 2.3
 2. Moderate intellectual disability (40 ≤ DQ < 55) 4 6.2 2 12.5
 3. Mild intellectual disability (55 ≤ DQ < 70) 4 6.2
 4. Without intellectual disability (DQ ≥ 70) 23 35.4 2 10.5
Expressive language
Functional language 43 63.2 4 23.5 6 31.6 .001 1 ≠ 2.3
 Words 7 10.3 8 47.1 4 21.1
 Mute 18 26.5 5 15.6 9 47.4
Gender .05
 Male 62 91.2 12 70.6 15 78.9
 Female 6 8.8 5 29.4 4 21.1
Gastrointestinal disorders 0.4
 Absence 43 63.2 9 52.9 14 73.7
 Presence 25 36.8 8 47.1 5 26.3
Sleeping disorders 0.5
 Absence 44 64.7 9 52.9 10 52.6
 Presence 24 35.3 8 47.1 9 47.4
Epilepsy 0.3
 Absence 58 85.3 13 76.5 18 94.7
 Presence 10 14.7 4 23.5 1 5.3

Significant associations (P value <.05) are presented in bold.

*

IntQ = (Q25; Q75).