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. Author manuscript; available in PMC: 2019 Jun 1.
Published in final edited form as: Am J Psychiatry. 2018 Jan 12;175(6):530–537. doi: 10.1176/appi.ajp.2017.17040442

Table 2.

Longitudinal mixed effects model for GDS total scores, measured annually, showing fixed effects predictors retained in final model

Model: R2=0.04 for fixed effects, p<0.0001; R2=0.82 including random terms, p<0.0001
Predictor Regression Coefficient 95% Confidence Interval Standard Error p value
PiB DVR interacting with time 0.65 0.02, 1.28 0.32 0.04
Depression history (yes) 1.36 0.35, 2.35 0.50 0.008
PiB 1.6 −0.49, 3.74 1.08 0.13
Years in study (time) −0.56 −1.31, 0.20 0.38 0.15

Abbreviations: GDS (Geriatric Depression Scale-30 item), PiB DVR (Pittsburgh Compound B distribution volume ratio). The regression coefficient is the unstandardized partial regression coefficient. For binary predictors, this is equivalent to the difference in adjusted means between the two groups.