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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 3.

Longitudinal mixed effects model for Anxiety-Concentration scores, measured annually, showing fixed effect predictors retained in final model

Model: R2=0.03 for fixed effects, p<0.0001; R2=0.71 including random terms, p<0.0001.
Predictor Regression Coefficient 95% Confidence Interval Standard Error p value
PiB DVR interacting with time 0.04 0.007, 0.067 0.015 0.015
Depression history (yes) 0.056 0.003, 0.107, 0.026 0.04
PiB 0.056 −0.059, 0.172 0.059 0.34
AMNART interacting with time −0.0007 −0.001, −0.00002 0.0003 0.045
Years in study (time) 0.043 −0.041, 0.127 0.042 0.31
AMNART 0.0002 −0.002, 0.002 0.001 0.81

Abbreviations: PiB DVR (Pittsburgh Compound B distribution volume ratio), AMNART (American National Adult Reading Test). 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.