Skip to main content

Table 3 Correlation matrix of study outcomes and relevant covariates

From: Impact of prenatal tobacco smoking on infant telomere length trajectory and ADHD symptoms at 18 months: a longitudinal cohort study

  4-month TL 12-month TL 18-month TL ADHD T-score Prenatal smoking Infant birthweight Sex Race SES Maternal pregnancy complications
4-month TL 1          
12-month TL 0.24** 1         
18-month TL 0.25** 0.24** 1        
ADHD T-score − 0.02 − 0.05 − 0.05 1       
Prenatal smoking 0.15 − 0.12 − 0.18* 0.13 1      
Infant birthweight − 0.04 − 0.14 0.02 0.05 − 0.17* 1     
Sex − 0.01 − 0.05 − 0.00 − 0.12 0.00 − 0.06 1    
Race 0.02 − 0.21** − 0.09 0.07 0.12 0.29**** 0.05 1   
SES 0.02 − 0.18* 0.02 − 0.04 − 0.17* 0.30**** 0.03 0.40**** 1  
Pregnancy complications − 0.05 − 0.01 − 0.02 − 0.10 − 0.08 − 0.22** 0.02 − 0.20** − 0.09 1
Maternal postnatal depression 0.05 0.10 − 0.13 0.23** 0.26** − 0.09 − 0.05 − 0.15 − 0.27*** 0.10
  1. Prenatal smoking: 0 = no, 1 = yes; sex: 1 = male, 2 = female; race: 0 = Black, 1 = White, 2 = other; pregnancy complications: 0 = no, 1 = yes
  2. *p < 0.05, **p < 0.01; ***p < 0.001; ****p < 0.0001