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Table 2: 
Comparison of fMRI scan quality between groups without a prescan interview and those with a prescan interview
Variable No Prescan Interview With Prescan Interview P Value
Patients (n = 96) Scans (n = 460) Patients (n = 106) Scans (n = 539)
Unacceptable sequences – 15.2% (70/460) – 10.9% (59/539) .04
Unacceptable studies 9.4% (9/96) – 1.9% (2/106) – .02
Fraction of outlying data points during time course – 0.65% – 0.59% .004
SD of linear displacements of image centroid (range, voxels) – 0.008 – 0.007 <.01
0.022 0.019 <.01
0.012 0.010 <.01
SD of angular displacements of image centroid (range) – 0.17° – 0.10° <.001
0.19° 0.12° <.001
0.21° 0.10° <.001

Note:—This analysis was conducted grouping the data on the scan/sequence basis and the patient basis. The extra numbers seen on the scan-basis analysis could not be meaningfully extended into the patient basis and therefore hyphens are used.