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Acceptance criteria for qualification (espec. PQ)

dear all,
im still confused bout the acceptance criteria for performance qualification (PQ), all i want to ask is does the acceptance criteria in PQ always with statistical calculation such as RSD or doesnt always with RSD calculation or is there other acceptance criteria?
im doing PQ for colloid mill, and i used “homogenity method for suspension” with comparison between before and after using colloid mill.

thank you
:confused: