12-Month PPS Estimator.xlsx
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Enter values in rows 4 to 11 of column B to estimate the probability that a medical or emergency surgical patient aged 80 or over will have a PPS≥60 or a PPS≥70 12 months after ICU admission.
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Predictor status at ICU admissionPatient values
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Baseline PPS (enter score from 0 to 100)80
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Male (1-male, 0-female)0
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Married (1-married, 0-single)1
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APACHE II (points)15
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Charlson Comorbidity Index (score)1
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Primary diagnosis of stroke (1-yes, 0-no)0
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Primary diagnosis of emergency CABG or Valve replacement (1-yes, 0-no)1
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Clinical frailty scale (enter score from 1 to 7)2
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PPS≥60
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Log of odds (logit) of PPS≥603.51
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Odds PPS≥6033.44
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Probability PPS≥600.97
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PPS≥70
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Log of odds (logit) of PPS≥702.72
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Odds PPS≥7015.15
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Probability PPS≥700.94
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PPS-Palliative performance scale
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Due to the limited precision of the tool, we recommend probabilities <0.1 be reported as "less than 10%" rather than using the exact probability provided, and we recommend any probabilities >0.5 be reported as "greater than 50%".
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Warning: This tool has not been independently validated.
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PPS predictor
Formulae
Sheet1