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They talk as much of what they have done to look for the missing – scanning every face as they drive, waiting blankly at the airport, being rebuffed by officials bound by privacy laws – as they do of their own feelings.
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Participant characteristics associated with missing scans were reported previously, and 18 participants died before the 40-month follow-up (23).
A practical limitation of our data is that there are missing scans in the longitudinal ultrasound follow-up.
Five others were non-evaluable as four had missing scan data and one patient was receiving adjuvant treatment.
For analysis of plaque score, negative binomial regression was carried out with additional adjustment for the number of missing scans.
In addition, missing scans or scans with obvious technical errors were found in three hip scans in the intervention group and one in the control group.
A maximum gap size was enforced between scans; for the 65% missing scan pattern, the maximum spacing permitted between scans was 55μm.
After exclusion of outliers, technical errors, and missing scans, anthropometrics were evaluated in 53 cases and 50 controls and femoral neck variables in 42 cases and 43 controls.
Although data were incomplete over the entire study period, they were complete for the two largest Trusts in the region and in our previous analysis of temporal trends we estimated that the proportion of missing scans and patients was small [ 9].
A survey consisting of 5 clinical scenarios with problems (wrong test performed, abnormal result not followed-up, abnormal result overlooked, blood tube broken and missing scan results) was sent by mail to AAFP members and by e-mail to the experts.
About one-quarter of the DXA scans could not be used in the analysis; scans were invalidated due to either weight and size limitations set by the equipment manufacturers or because a body part (e.g., arm or leg) was completely or partially off the scanner, there was hand-hip overlap, or there was movement during the scan (specific reasons for missing scan data were not recorded during the trial).
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CEO of Professional Science Editing for Scientists @ prosciediting.com