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. Author manuscript; available in PMC: 2009 Apr 15.
Published in final edited form as: Neuroimage. 2008 Jan 5;40(3):1181–1194. doi: 10.1016/j.neuroimage.2007.12.040

Table 2.

ANCOVA Results for the Visual Activation Task

Median Percent Signal Change
Effect df F-Value ProbF
Age 1, 24.9 2.18 0.1525
Dx 1, 28.1 0.03 0.8697
SMOK 1, 27.9 15.49 0.0005
Dx*SMOK 1, 27.3 2.20 0.1499
Mean Percent Signal Change
Effect df F-Value ProbF
Age 1, 18.6 5.51 0.0301
Dx 1, 19.5 0.02 0.8983
SMOK 1, 19.3 5.30 0.0326
Dx*SMOK 1, 18.9 3.22 0.0889
Activation Volume in Voxels
Effect df F-Value ProbF
Age 1, 17.8 0.73 0.4048
Dx 1, 28.0 0.23 0.6322
SMOK 1, 27.8 4.62 0.0405
Dx*SMOK 1, 27.2 0.51 0.4818
Mean Time to Peak
Effect df F-Value ProbF
Age 1, 24.4 0.28 0.5994
Dx 1, 28.6 0.43 0.5182
SMOK 1, 28.4 3.57 0.0692
Dx*SMOK 1, 27.9 12.71 0.0013
Mean Time to Trough
Effect df F-Value ProbF
Age 1, 20.4 0.08 0.7809
Dx 1, 28.5 0.14 0.7071
SMOK 1, 28.3 14.98 0.0006
Dx*SMOK 1, 27.7 1.62 0.2138