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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.