Skip to main content


Log in

Validation of severity scoring systems SAPS II and APACHE II in a single-center population

  • Original
  • Published:
Intensive Care Medicine Aims and scope Submit manuscript


Objective: To validate two severity scoring systems, the Simplified Acute Physiology Score (SAPS II) and Acute Physiology and Chronic Health Evaluation (APACHE II), in a single-center ICU population.

Design and setting: Prospective data collection in a two four-bed multidisciplinary ICUs of a teaching hospital.

Patients and methods: Data were collected in ICU over 4 years on 1721 consecutively admitted patients (aged 18 years or older, no transferrals, ICU stay at least 24 h) regarding SAPS II, APACHE II, predicted hospital mortality, and survival upon hospital discharge.

Results: At the predicted risk of 0.5, sensitivity was 39.4% for SAPS II and 31.6% for APACHE II, specificity 95.6% and 97.2%, and correct classification rate 85.6% and 85.5%, respectively. The area under the ROC curve was higher than 0.8 for both models. The goodness-of-fit statistic showed no significant difference between observed and predicted hospital mortality (H=7.62 for SAPS II, H=3.87 for APACHE II; and C=9.32 and C=5.05, respectively). Observed hospital mortality of patients with risk of death higher than 60% was overpredicted by SAPS II and underpredicted by APACHE II. The observed hospital mortality was significantly higher than that predicted by the models in medical patients and in those admitted from the ward.

Conclusions: This study validates both SAPS II and APACHE II scores in an ICU population comprised mainly of surgical patients. The type of ICU admission and the location in the hospital before ICU admission influence the predictive ability of the models.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

Author information

Authors and Affiliations


Additional information

Final revision received: 9 August 2000

Electronic Publication

Rights and permissions

Reprints and permissions

About this article

Cite this article

Capuzzo, M., Valpondi, V., Sgarbi, A. et al. Validation of severity scoring systems SAPS II and APACHE II in a single-center population. Intensive Care Med 26, 1779–1785 (2000).

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: