Point-of-care tests, diagnostic uncertainty and antimicrobial stewardship in the ICU: procalcitonin or PCR to aid antibiotic-stop decisions - an observational cohort study.

This effect was highly significant in the improvement scenario (72.7% vs 86.4%; χ 2 =10.50, df=1, p=0.001), significant in disc clin better (28.8% vs 42.4%; χ 2 =5.01, df=1, p=0.025) and non-significant in disc clin worse (36.4% vs 37.9%, χ 2 =0.07, df=1, p=0.797).

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