Table 1 Correlations among variables.

From: Maternal heart rate variability at 3-months postpartum is associated with maternal mental health and infant neurophysiology

Variable

M

SD

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

1. HF HRV

32.78

16.2

                

2. LFHF ratio

3.19

3.07

− 0.76**

               

3. DFA alpha

1.19

0.24

− 0.89**

0.74**

              

4. mHRV Factor Score 

0

0.98

0.98**

− 0.81**

− 0.96**

             

5. Maternal depression

5.6

4.4

− 0.24*

0.27*

0.16

− 0.24*

            

6. Maternal anxiety

33.24

10.5

− 0.2

0.22

0.1

− 0.19

0.75**

           

7. Maternal perceived stress

13.06

6.15

− 0.15

0.13

0.05

− 0.13

0.75**

0.77**

          

8. Maternal resting HR

77.22

11.3

− 0.41**

0.49**

0.50**

− 0.47**

− 0.01

− 0.04

− 0.01

         

9. State anxiety

30.76

9.4

− 0.1

0.14

0.01

− 0.08

0.68**

0.86**

0.74**

− 0.02

        

10. Income-to-needs

5.31

5.51

− 0.17

0.04

0

− 0.11

− 0.06

0.01

− 0.12

− 0.26*

− 0.04

       

11. Maternal age

32.86

5.45

0.07

− 0.08

− 0.08

0.11

− 0.01

− 0.03

0.01

− 0.27*

− 0.05

0.30**

      

12. Infant HRV Factor Score

0

0.99

0.27*

− 0.19

− 0.15

0.25*

− 0.14

− 0.17

− 0.15

0.05

− 0.14

− 0.21

− 0.01

     

13. Infant theta-beta ratio

5.62

1.45

− 0.30*

0.38**

0.22

− 0.30*

0

− 0.03

− 0.08

0.16

0

0.1

− 0.17

− 0.34**

    

14. Infant frontal alpha asymmetry

0.03

0.15

− 0.01

0.15

0.07

− 0.06

0.19

0.07

0.19

0.1

0.05

− 0.21

0.09

− 0.02

0.02

   

14. Dyadic physiological synchrony

0.04

0.29

− 0.04

0.03

0.07

− 0.05

0.13

0.26*

0.22

0.19

0.21

0

0.02

0.27*

− 0.14

0.04

  

15. Infant age (months)

3.47

0.39

− 0.04

0.17

− 0.04

− 0.04

0.04

0.06

0.09

0.17

0.12

− 0.16

0.11

− 0.03

0.18

0.12

− 0.06

 

16. Gestational age (weeks)

39.21

1.23

0.07

− 0.17

− 0.09

0.08

− 0.16

− 0.12

0.04

− 0.02

0

− 0.11

− 0.08

− 0.08

− 0.26*

− 0.02

0.05

− 0.27**

  1. Pearson correlations of key variables. Significant correlations in the hypothesized direction between primary variables provided rationale for subsequent regression models.