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They had all been recommended and trained through the WDPF. Ten volunteers with visual disabilities were recruited to participate in the training sessions for the interviewers.
The four levels of visual disability recognized by the WDPF were categorized as 'blind' (level 1 and level 2) or 'visually impaired' (level 3 and level 4).
All 22,184 visually disabled individuals registered with the WDPF included 49.3% males and their average age was 47.3 years; the proportion of males in our sample was higher ([chi square]=36.2, p<0.001), but the mean age was similar (t=1.5, p=0.135).
The WDPF, for example, can inform the operator if a blade-path temperature spread on the hot end of the turbine means there is a blade or combustion problem.
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