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Table 2 RBS-R subscale scores, subscale number of endorsed items, overall total score, and overall total number of endorsed items, stratified by ID severity. Statistic pertains to comparison of variable versus quantitative IQ (not ID group). We used Spearman rank correlation to correlate IQ with variable.

From: Parent-reported measure of repetitive behavior in Phelan-McDermid syndrome

  Mild ID Moderate ID Severe-profound ID Entire cohort Statistic p-value Adjusted p-value
  Mean SD N Mean SD N Mean SD N Mean SD N    
Stereotyped behavior subscale score 1.75 2.19 8 4.05 5.1 20 6.4 4.76 62 5.47 4.88 90 rs
= -0.33
0.0014 0.011
Stereotyped behavior subscale number of endorsed items 1.62 2 8 2.6 2.33 20 4.02 2.36 62 3.49 2.45 90 rs
= -0.32
0.0019 0.011
Self-injurious behavior subscale score 0.75 1.16 8 2.15 2.64 20 2.27 2.63 62 2.11 2.55 90 rs
= -0.18
0.10 0.23
Self-injurious behavior subscale number of endorsed items 0.75 1.16 8 1.45 1.57 20 1.48 1.54 62 1.41 1.52 90 rs
= -0.15
0.17 0.25
Compulsive subscale score 0.25 0.46 8 3.15 3.51 20 1.27 1.99 62 1.6 2.48 90 rs
= 0.16
0.14 0.24
Compulsive subscale number of endorsed items 0.25 0.46 8 2.05 1.9 20 0.73 1.09 62 0.98 1.4 90 rs
= 0.19
0.07 0.20
Ritualistic/sameness subscale score 4.25 6.14 8 6 4.83 20 4.18 5.86 62 4.59 5.66 90 rs
= 0.07
0.50 0.50
Ritualistic/sameness subscale number of endorsed items 2.88 3.23 8 4.3 3.1 20 2.65 2.79 62 3.03 2.94 90 rs
= 0.09
0.39 0.43
Restricted subscale score 0.5 1.07 8 2.65 2.39 20 2.98 2.63 62 2.69 2.56 90 rs
= -0.21
0.04 0.17
Restricted subscale number of endorsed items 0.38 0.74 8 1.65 1.14 20 1.58 1.08 62 1.49 1.11 90 rs
= -0.13
0.24 0.31
Total score 7.5 9.18 8 18 14.92 20 17.11 13.74 62 16.46 13.85 90 rs
= -0.16
0.13 0.24
Total number of endorsed items 5.88 5.74 8 12.05 7.94 20 10.45 6.38 62 10.4 6.81 90 rs
= -0.10
0.37 0.43