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Table 3 Final model for prediction of NIV failure in the derivation cohort and points assigned to each variable

From: Early prediction of noninvasive ventilation failure in COPD patients: derivation, internal validation, and external validation of a simple risk score

VariablesRegression coefficient β per unit increaseCategory (j)Assigned points
Respiratory rate at 1–2 h of NIV, breaths/min0.062< 300
30–341
35–392
≥ 403
Heart rate at 1–2 h of NIV, beats/min0.027< 1000
100–1191
120–1392
 ≥ 1403
pH at 1–2 h of NIV− 15.851≥ 7.350
7.30–7.342
7.25–7.293
7.20–7.245
< 7.208
GCS at 1–2 h of NIV− 0.992150
142
134
126
≤ 1111
PaO2/FiO2 at 1–2 h of NIV, mmHg− 0.005≥ 1500
101–1491
≤ 1002
  1. NIV noninvasive ventilation, GCS Glasgow coma scale