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. Author manuscript; available in PMC: 2021 Nov 1.
Published in final edited form as: Neuropsychology. 2020 Nov;34(8):862–873. doi: 10.1037/neu0000694

Table 2.

Parameter estimates for mixed effects models of longitudinal everyday functioning trajectories by cognitive group

IADL Performance IADL Difficulty
b S.E. t p r b S.E. t p r
Intercept 8.154 1.201 6.790 <.001 .130 0.081 0.625 0.125 .897 .003
Age 0.013 0.013 0.933 .351 .018 0.029 0.007 4.097 <.001 .081
Education 0.053 0.030 1.774 .076 .034 0.031 0.016 1.993 .046 .040
Female −5.340 0.178 −30.049 <.001 −.503 −0.393 0.092 −4.243 <.001 −.085
Black/African American −0.932 0.205 −4.556 <.001 −.088 −0.069 0.106 −0.651 .516 −.013
SF-36 Physical Functioning −0.024 0.003 −7.382 <.001 −.142 −0.033 0.002 −19.165 <.001 −.359
CES-D −0.028 0.015 −1.864 .062 −.036 0.056 0.008 7.014 <.001 .139
Time 0.350 0.049 7.206 <.001 .175 0.434 0.042 10.436 <.001 .252
Time2 0.058 0.007 7.925 <.001 .103 0.047 0.005 8.708 <.001 .116
Cognitive Group
 CN (ref) - - - - - - - - -
 naMCI 0.145 0.326 0.445 .656 .008 0.383 0.179 2.134 .033 .040
 single-aMCI 0.833 0.310 2.689 .007 .047 0.256 0.174 1.472 .142 .026
 multi-aMCI 0.263 0.447 0.588 .557 .010 0.104 0.256 0.286 .685 .007
Time x Cognitive Group
 Time x CN (ref) - - - - - - - - -
 Time x naMCI 0.160 0.103 1.563 .118 .038 0.250 0.087 2.866 .004 .070
 Time x single-aMCI 0.614 0.103 5.982 <.001 .132 0.666 0.086 7.759 <.001 .170
 Time x multi-aMCI 0.932 0.153 6.088 <.001 .129 0.820 0.127 6.575 <.001 .136
Time2 x Cognitive Group
 Time2 x CN (ref) - - - - - - - - -
 Time2 x naMCI −0.018 0.015 −1.175 .240 −.015 0.009 0.011 0.780 .435 .010
 Time2 x aMCI −0.017 0.016 −1.092 .275 −.013 0.009 0.011 0.822 .409 .010
 Time2 x multi-aMCI 0.043 0.023 1.815 .070 .022 0.044 0.017 2.668 .011 .033

Bold values represent p<.005. CN=cognitively normal; single-aMCI=single-domain amnestic MCI; multi-aMCI=multi-domain aMCI; naMCI=nonamnestic MCI; CES-D=Center for Epidemiological Studies-Depression-12; SF-36=36-Item Short-Form Health Survey; IADL=Instrumental Activities of Daily Living. Site, replicate, booster group, intervention group, Time x intervention, and Time2 x intervention group were also adjusted for in the models (see supplemental material).