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Table 1 Descriptive statistics for the Pediatric Sleep Questionnaire SRBD scale and subscales

From: Sleep characteristics and problems of 2-year-olds with Williams syndrome: relations with language and behavior

SRBD scale or subscale N Maximum possible score M (SD) Mdn (IQR) Range N positive (%)
SRBDb 96 21a 3.74 (2.72) 3.00 (2.00–5.75) 0–11 15 (15.6%)
Snoring 92 4 0.41 (0.76) 0 (0–1) 0–3 26 (28.3%)
Sleepiness 70 4 0.51 (0.93) 0 (0–1) 0–4 21 (30.0%)
Behavior 96 6 1.99 (1.65) 2 (1–3) 0–6 75 (78.1%)
  1. SRBD Sleep-Related Breathing Disorder, IQR interquartile range
  2. aScore of 7 or higher on the SRBD scale, 1 or higher on the Snoring and Sleepiness subscales, and 2 or higher on the Behavior subscale
  3. bThe 22nd item, measuring nocturnal enuresis, was excluded because nocturnal enuresis is developmentally appropriate for 2-year-olds