Can short PROMs support valid factor-based sub-scores? Example of COMQ-12 in chronic otitis media.

(e) On doing this, the MV skew became stronger than for raw data in the present dataset, but this is of less concern; the Mardia kurtosis that was highly significant in the raw values, though still positive (1.3) became NS (p=0.19) on the residuals.

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