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Table 5 Bivariate correlations among the measures included in the regression analyses

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

  2 3 4 5 6 7 8
1. CDI-EV SS .88** .65** .63** − .31* .01 .17 − .09
2. MSEL Expressive Language T   .68** .63** − .28* − .05 .17 − .10
3. MSEL Receptive Language T    .68** − .32* − .05 .16 − .15
4. MSEL Visual Reception T     − .36** − .13 − .08 − .19
5. CBCL Internalizing Problems T      .45** − .22 .17
6. CBCL Externalizing Problems T       − .02 .50**
7. Nighttime sleep duration        − .01
8. Sleepiness score        
  1. N = 96 for all correlations except those including Sleepiness score, for which N = 70
  2. CDI-EV SS MacArthur-Bates Communicative Development Inventory: Words and Sentences expressive vocabulary standard score, MSEL Mullen Scales of Early Learning, CBCL Child Behavior Checklist
  3. *p < .01, **p < .001