Reliability of Observation Variables in Distinguishing Infectious Outcome of Febrile Young Infants

Pediatr Infect Dis J. 1993 Feb;12(2):111-4. doi: 10.1097/00006454-199302000-00001.


We prospectively evaluated 7 observation variables (level of activity, level of alertness, respiratory status/effort, peripheral perfusion, muscle tone, affect, feeding pattern) which qualify patient clinical appearance in order to determine reliability in distinguishing the infectious outcome of 233 febrile infants ages 0 to 8 weeks. Each variable was graded either 1, 3, or 5, with a higher score indicative of a greater degree of compromise. All infants received physical examination and sepsis evaluation (lumbar puncture, complete blood count/blood culture, urinalysis/urine culture). The 3 outcome groups compared were 29 cases of serious bacterial infections, (+SBI; 10 with bacterial meningitis, 12 with bacteremia, 7 with urinary tract infection), 45 cases of aseptic meningitis (AM) and 159 cases culture-negative with normal cerebrospinal fluid (CN-NCSF). The mean score for each of the 7 variables was significantly greater in the +SBI group compared with both the AM and CN-NCSF groups (P < 0.05), whereas there was no significant difference in mean score for each of the 7 variables between the AM and CN-NCSF groups. Stepwise discriminant analysis identified 3 variables that best distinguished outcome: affect; respiratory status/effort; and peripheral perfusion, which constituted the Young Infant Observation Scale. The mean total Young Infant Observation Scale score generated from assessing these 3 variables was significantly greater (P = 0.0001) in the +SBI, group (9) compared with both the AM (5) and CN-NCSF (5) groups. A total Young Infant Observation Scale score > or = 7 had a sensitivity of 76%, specificity of 75% and negative-predictive value of 96% for outcome of +SBI.

MeSH terms

  • Bacterial Infections / diagnosis*
  • Bacterial Infections / epidemiology
  • Fever / etiology
  • Humans
  • Infant
  • Infant, Newborn
  • Meningitis, Aseptic / diagnosis*
  • Meningitis, Aseptic / epidemiology
  • Observer Variation*
  • Outcome Assessment, Health Care / statistics & numerical data*
  • Predictive Value of Tests
  • Prospective Studies
  • Sick Role*