title: Tiss 76 and Tiss 28: correlation of two therapeutic activity indices on a Spanish multicenter ICU database.
abstract: OBJECTIVE
  To evaluate the performance of the Simplified Therapeutic Intervention Scoring System (TISS 28) on an independent database and to determine its relation to the original Therapeutic Intervention Scoring System (TISS 76).
  
  
  METHODS
  Analysis of the database of the Spanish prospective multicenter study PAEEC (Project for the Epidemiological Analysis of Critical Care Patients).
  
  
  METHODS
  86 intensive care units (ICUs) in Spain.
  
  
  METHODS
  Data on 8838 patients admitted to the ICUs.
  
  
  RESULTS
  Administrative data, main diagnostic category, severity score [Acute Physiology and Chronic Health Evaluation (APACHE) II and III] and data for the calculation of the TISS 76 and TISS 28 were collected during the first 24 h after the patient's ICU admission. TISS 76 and TISS 28 scores were calculated and analyzed on how they varied according to other variables (diagnostic group, severity level, hospital size and age). The association between TISS 76 and TISS 28 was studied. The TISS 76 score was 21 +/- 10.5 points and the TISS 28 score 23.3 +/- 8.8 points. There was a good correlation between TISS 76 and TISS 28 (r = 0.85). The regression equation was: TISS 28 = 8.35 + (0.712 x TISS 76). The TISS 28 score behaved similarly to the TISS 76 score in relation to the other variables, with a positive correlation between the therapeutic and the severity level (APACHE II and III) and a negative correlation between therapeutic activity and age, with very similar correlation coefficients. Both TISS 28 and TISS 76 scores were higher in larger hospitals.
  
  
  CONCLUSIONS
  There is a strong correlation between TISS 28 and TISS 76 scores in the PAEEC database and TISS 28 works correctly in our setting.
authors.affiliation: Servicio de Medicina Intensiva, CRT Hospital Virgen de las Nieves, Carretera de Jaen sn, E-18013 Granada, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Castillo-Lorente
authors.forename: R
authors.initials: R
authors.lastname: Rivera-Fernandez
authors.forename: M
authors.initials: M
authors.lastname: Rodriguez-Elvira
authors.forename: G
authors.initials: G
authors.lastname: Vazquez-Mata
mesh_terms: D018806:APACHE; D000368:Aged; D016208:Databases, Factual; D005069:Evaluation Studies as Topic; D005260:Female; D017052:Hospital Mortality; D006801:Humans; D007362:Intensive Care Units / Q000592:standards / Q000706:statistics & numerical data; D007902:Length of Stay; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D013030:Spain; D016526:Workload