. 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 4.

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

Model: R²=0.05 for fixed effects, p<0.0001; R²=0.75 including random terms, p<0.0001.
Predictor	Regression Coefficient	95% Confidence Interval	Standard Error	p value
Age interacting with time	0.001	0.0001, 0.002	0.0005	0.03
Hollingshead interacting with time	−0.0005	−0.0008, −0.00008,	0.0002	0.02
AMNART	0.003	0.0008, 0.006	0.001	0.009
Age	0.002	−0.002, 0.005	0.002	0.39
Hollingshead	0.0007	−0.0008, 0.002	0.0008	0.37
Years in study (time)	−0.06	−0.13, 0.017	0.04	0.13

Abbreviations: AMNART (American National Adult Reading Test intelligence quotient)