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.