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Attrition analysis results showed that except for age [χ2(7) = 15.38, p<0.05], there were no significant differences in gender [χ2(1) = 1.03, p>0.05], ethnicity [χ2(3) = 4.40, p>0.05], intrusive symptom clusters of PTSD [t(348) = 0.86, p>0.05], avoidance symptom clusters of PTSD [t(348) = 0.60, p>0.05], hyperarousal symptom clusters of PTSD [t(348) = 0.78, p>0.05] and sleep problems [t(348) = 0.63, p>0.05].
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