Table 4.

Final CIPHER (Collaborative Integrated Pregnancy High-dependency Estimate of Risk) model

Logit(p) = 3.087 + [−1.912 × 10−5 (maternal age)3] + [−0.776(positive surgical status within 24 h of admission)] + [−0.138 (Glasgow Coma Scale score)] + [−7.123 × 10−3 (systolic blood pressure)] + [−0.319 (serum potassium)] + [1.373 × 10−4 (serum sodium)2] + [4.934 × 10−3 (serum bilirubin)] + [4.673 × 10−3 (serum creatinine)] + [1.584 × 10−2 (activated partial thromboplastin time)] + [−0.570 (arterial blood gas pH)] Maternal age (years); surgical status (yes/no); Glasgow Coma Scale score (ordinal units); systolic blood pressure (millimeter of mercury); serum bilirubin (micromole per liter); serum creatinine (micromole per liter)