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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