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MRI scan quantity and quality in childhood
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Table 3. Genetic modeling of framewise and absolute head displacement for all participants scanned (prior to motion exclusion, including excessive head motion); for participants with moderate head motion (excluding excessive head motion); and for participants with minimal head motion (after stringent quality control).
Max motion
Excessive head motion Framewise Displacement
Absolute Displacement
Subtle head motion° Framewise Displacement
Absolute Displacement
Minimal head motion˟ Framewise Displacement
Absolute Displacement
MZ DZ
r .51** 0.19 ACE
n1 129 108 95% CI
r .70** 0.17 ACE
n1 129 108 95% CI
r .29** .28* ACE
n1 96 72 95% CI
r .29** 0.23 ACE
n1 92 67 95% CI
r 0.26 .49* ACE
n1 28 18 95% CI
r 0.32 0.28 ACE
n1 24 20 95% CI
A2 C2 E2
0.29 0.05 0.66
0.00-0.46 0.00-0.39
0.65 0 0.35
0.54-0.73 0.00-0.12
0.12 0.22 0.66
0.54-0.80
0.27-0.46
0.00-0.52 0.00-0.45
0.14 0.15 0.71
0.00-0.46 0.00-0.39
0 0.33 0.67
0.48-0.84
0.54-0.90
0.00-0.47 0.00-0.54
0.06 0.29 0.65
0.00-0.61 0.00-0.55
0.39-0.95
0.46-0.94
* p<.05, ** p<.001, 1 Number of complete twin pairs
° mean FD <1 mm; mean AD < 3mm; ˟ mean FD <0.3 mm; mean AD <1 mm
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