Journal of Aging Research

Research Article

Do Depressive Traits and Hostility Predict Age-Related Decline in General Intelligence?

Table 5

Abbreviated Cook-Medley hostility scale: effects on WAIS IQs from 50 to 80.
Model Coefficient1 95% CI 𝑃 for
main effect		Interaction2 coefficient 𝑃 for interaction
Full Scale IQ     
 Model 1: Unadjusted3 βˆ’ 0 . 5 2 4 (βˆ’0.74)–(βˆ’0.31) <0.001 0.003 0.378
 Model 2: Demographics4 βˆ’ 0 . 3 2 0 (βˆ’0.49)–(βˆ’0.15)
<0.001 0.003 0.386
 Model 3: Lifestyle factors5 βˆ’ 0 . 3 1 1 (βˆ’0.48)–(βˆ’0.14) <0.001 0.003 0.391
Verbal IQ     
 Model 1: Unadjusted3 βˆ’ 0 . 4 9 6 (βˆ’0.71)–(βˆ’0.28) <0.001 0.002 0.655
 Model 2: Demographics4 βˆ’ 0 . 2 8 3 (βˆ’0.45)–(βˆ’0.11)
0.001 0.001 0.690
 Model 3: Lifestyle factors5 βˆ’ 0 . 2 6 6 (βˆ’0.44)–(βˆ’0.10) 0.002 0.001 0.699
Performance IQ     
 Model 1: Unadjusted3 βˆ’ 0 . 4 5 1 (βˆ’0.66)–(βˆ’0.24) <0.001 0.005 0.269
 Model 2: Demographics4 βˆ’ 0 . 2 9 5 (βˆ’0.48)–(βˆ’0.11)
0.002 0.005 0.272
 Model 3: Lifestyle factors5 βˆ’ 0 . 2 9 7 (βˆ’0.48)–(βˆ’0.12) 0.001 0.005 0.280
1Fixed effect coefficient from a model only including the main effect of the hostility scale. See Section 3 for description of the effects of hostility on the estimates of the random-effects.
2Interaction coefficient from a model including a term for interaction between the abbreviated Cook-Medley Hostility Scale and time since baseline. Additionally all relevant main effects are included in the model.
3Model includes linear and quadratic time since baseline and the abbreviated Cook-Medley hostility scale.
4Model additionally includes sex, education and social status.
5Model additionally includes sex, education, social status, systolic blood pressure, smoking, BMI, total cholesterol, triglycerides, insulin and leisure and work physical activity.