Several AUs showed statistically significant or marginally significant group differences.
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Subthreshold depression is associated with altered facial expression and impression formation via subjective ratings and action unit analysis.
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The sentences
Specifically, AU05_r (Upper Lid Raiser) reached statistical significance ( p =.03), while AU20_r (Lip Stretcher), AU01_c (Inner Brow Raiser), AU20_c (Lip Stretcher), AU23_c (Lip Tightener), and AU26_c (Jaw Drop) showed marginal significance ( p -values ranging from 0.045 to 0.077).