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Table 9 Number and percentage of individuals with PTHS and matched AS and CdLS displaying challenging behaviour and chi-squared analysis

From: Behavioural and psychological characteristics in Pitt-Hopkins syndrome: a comparison with Angelman and Cornelia de Lange syndromes

  PTHS, N = 24 AS, N = 24 CdLS, N = 24 Chi-squared test Post hoc comparison: chi-squared test
χ 2 df p value Comparison χ 2 df p value Relative risk (95% CI)
Displayed SIB in the last month (%) 17 (70.8%) 10 (41.7%) 19 (79.2%) 8.07 2 .018 PTHS > AS 4.15 1 .042 1.70 (.99 to 2.91)a
Displayed destruction of property in the last month (%) 9 (37.5%) 13 (54.2%) 13 (54.2%) 1.78 2 .411      
Displayed physical aggression in the last month (%) 13 (54.2%) 16 (66.7%) 6 (25%) 8.79 2 .012 PTHS > CdLS 4.27 1 .039 2.17 (.99 to 4.75)b
Displayed stereotyped behaviour in the last month (%) 18 (75%) 16 (66.7%) 21 (87.5%) 2.93 2 .232      
  1. aRelative risk of self-injurious behaviour in AS relative to PTHS
  2. bRelative risk of physical aggression in CdLS relative to PTHS