Table 3. Reasons for scan failure in the whole sample and by ethnicity.
| Reason for failure | Total | White | Black | South Asian | Other | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No | %1 | %2 | No | %1 | %2 | No | %1 | %2 | No | %1 | %2 | No | %1 | %2 | |
| Clothing artefact | 126 | 8.7 | 29.7 | 61 | 11.2 | 43.3 | 29 | 6.7 | 17.9 | 24 | 8.5 | 29.3 | 12 | 6.4 | 30.8 |
| Failed to create body image | 127 | 8.8 | 29.9 | 31 | 5.7 | 22.0 | 60 | 14.0 | 37.0 | 28 | 9.9 | 34.1 | 8 | 4.3 | 20.5 |
| Failed to extract 3D outcomes | 115 | 8.0 | 27.1 | 36 | 6.6 | 25.5 | 41 | 9.5 | 25.3 | 22 | 7.8 | 26.8 | 16 | 8.5 | 41.0 |
| Movement during scanning | 40 | 2.8 | 9.4 | 5 | 0.9 | 3.5 | 26 | 6.0 | 16.0 | 7 | 2.5 | 8.5 | 2 | 1.1 | 5.1 |
| Other (system failure, fear of dark) | 16 | 1.1 | 3.8 | 8 | 1.5 | 5.7 | 6 | 1.4 | 3.7 | 1 | 0.4 | 1.2 | 1 | 0.5 | 2.6 |
| Total | 424 | 29.3 | 100 | 141 | 25.8 | 100 | 162 | 37.7 | 100 | 82 | 29.1 | 100 | 39 | 20.7 | 100 |
%1—percentage of all children scanned in this group
%2—percentage of failed scans in this group