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Table 4 Unadjusted mean SDQ scores, by cohort and grandparent mental health history

From: A three generation study of the mental health relationships between grandparents, parents and children

Grandparent mental health history

N

Mean SDQ

95% CI

Test statistic

p-value

B cohort (4–5 Years)

Maternal grandmother

No

2194

8.1

7.9–8.3

t(1207.8) = 4.1

<.001

 

Yes

751

8.9

8.5–9.2

  

Maternal grandfather

No

2464

8.2

8.0–8.4

t(653.7) = 3.1

.002

 

Yes

475

9.0

8.6–9.4

  

Paternal grandmother

No

2083

8.0

7.8–8.3

t(914.4) = 1.7

.083

 

Yes

562

8.3

8.0–8.7

  

Paternal grandfather

No

2332

8.0

7.8–8.2

t(401.5) = 1.9

.052

 

Yes

316

8.7

8.2–9.3

  

K cohort (8–9 Years)

Maternal grandmother

No

2159

7.3

7.0–7.5

t(1205.8) = 3.6

<.001

 

Yes

736

8.1

7.7–8.5

  

Maternal grandfather

No

2447

7.2

7.0–7.4

t(565.4) = 4.4

<.001

 

Yes

436

8.8

8.2–9.3

  

Paternal grandmother

No

2066

6.9

6.7–7.1

t(703.0) = 3.1

.002

 

Yes

486

7.7

7.3–8.2

  

Paternal grandfather

No

2233

6.9

6.7–7.2

t(396.7) = 2.2

.027

 

Yes

318

7.7

7.2–8.3

  

Total

Maternal grandmother

No

4353

7.7

7.5–7.9

t(2419.2) = 5.4

<.001

 

Yes

1487

8.5

8.2–8.8

  

Maternal grandfather

No

4911

7.7

7.5–7.9

t(1219.2) = 5.4

.002

 

Yes

911

8.9

8.5–9.2

  

Paternal grandmother

No

4149

7.5

7.3–7.6

t(1612.2) = 3.7

<.001

 

Yes

1048

8.0

7.7–8.4

  

Paternal grandfather

No

4565

7.5

7.3–7.7

t(798.7) = 2.9

.004

 

Yes

634

8.2

7.7–8.7

  
  1. T-test assumes variances are unequal.