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. Author manuscript; available in PMC: 2017 May 1.
Published in final edited form as: Neuropsychology. 2016 Jan 11;30(4):449–473. doi: 10.1037/neu0000259

Table 3.

Composite scores: Proportion of variance accounted for by the Age Full Model (GAM†) and the Full Model without SES, site, ethnicity, or sex as covariates

N FM FM w/o SES SES Effect FM w/o Site Site Effect FM w/o Ethnicity Ethnicity Effect FM w/o Sex Sex Effect Linear Age w/o covariates
Age x Sex Interaction R2 F p N
ACCURACY †† †† †† ††
Abstraction 657 R2 = 0.167**** 0.148 0.019 0.138 0.029 0.127 0.040 0.164 0.004 n.s. 0.039 14.410 0.0000 683
Attention 664 R2 = 0.125**** 0.111 0.014 0.117 0.008 0.120 0.005 0.124 0.001 n.s. 0.096 36.990 0.0000 690
Balance 652 R2 = 0.096**** 0.083 0.013 0.068 0.028 0.096 0.000 0.097 0.000 t=−2.498, p=.0127 0.017 6.209 0.0013 676
Emotion 664 R2 = 0.104**** 0.094 0.010 0.104 0.000 0.102 0.002 0.085 0.019 n.s. 0.072 27.020 0.0000 690
Episodic Memory 663 R2 = 0.060**** 0.039 0.022 0.059 0.001 0.048 0.012 0.059 0.001 n.s. 0.003 1.151 0.0670 689
General Ability 663 R2 = 0.399**** 0.310 0.089 0.371 0.028 0.352 0.047 0.397 0.002 t=−2.425, p=.0156 0.148 60.170 0.0000 689
Working Memory 661 R2 = 0.055**** 0.048 0.007 0.052 0.003 0.030 0.025 0.053 0.002 n.s. 0.006 2.483 0.0516 687
SPEED
Abstraction 657 R2 = 0.025** 0.024 0.001 0.030 0.000 0.015 0.010 0.026 0.000 n.s. 0.011 4.330 0.0060 683
Attention 660 R2 = 0.123**** 0.118 0.004 0.117 0.005 0.125 0.000 0.121 0.002 n.s. 0.103 39.850 0.0000 686
Emotion 663 R2 = 0.029*** 0.030 0.000 0.030 0.000 0.009 0.020 0.028 0.001 n.s. 0.004 1.192 0.0646 689
Episodic Memory 663 R2 = 0.048**** 0.048 0.000 0.028 0.020 0.049 0.000 0.040 0.008 t=1.981, p=.0480 0.020 6.733 0.0001 689
General Ability 664 R2 = 0.047*** 0.040 0.007 0.043 0.004 0.039 0.008 0.047 0.000 n.s. 0.017 6.087 0.0005 690
Motor Speed 653 R2 = 0.302**** 0.290 0.012 0.293 0.009 0.255 0.047 0.295 0.007 n.s. 0.170 67.790 0.0000 677
Working Memory 661 R2 = 0.008 0.010 0.000 0.002 0.006 0.011 0.000 0.002 0.006 n.s. 0.000 0.000 0.6600 687
TOTAL ACCURACY AND SPEED
Accuracy 639 R2 = 0.305**** 0.245 0.060 0.287 0.018 0.262 0.043 0.305 0.000 n.s. 0.121 46.170 0.0000 663
Speed 639 R2 = 0.085**** 0.085 0.000 0.089 0.000 0.076 0.008 0.086 0.000 n.s. 0.066 23.890 0.0000 663
Accuracy-Speed 632 R2 = 0.057*** 0.029 0.028 0.051 0.006 0.051 0.006 0.055 0.002 t=−2.698, p=.0072 0.002 0.677 0.1270 656

GAM=general additive model

SES=socioeconomic status

FM=full model

w/o=without

†

FM=GAM(domain~age + site +SES + ethnicity + sex)

††

Bold font indicates significant χ2 test of the effect of removing a covariate from the model (p<.05)

*

p≤.05,

**

p≤.01,

***

p=.001,

****

p≤.0001,

n.s.=not significant