title: Predicting the duration of symptoms in lower respiratory tract infection.
abstract: BACKGROUND
  Acute lower respiratory tract infection (LRTI) presenting in primary care has a long natural history. Antibiotic treatment makes little or no difference to the duration of cough. Limited information is currently available regarding predictors of illness duration.
  
  
  OBJECTIVE
  To determine predictors of illness duration in acute LRTI in primary care.
  
  
  METHODS
  Secondary analysis of trial data to identify independent predictors of illness severity and duration.
  
  
  METHODS
  Primary care.
  
  
  METHODS
  Eight-hundred and seven patients aged 3 years and over with acute illness (21 days or less) presenting with cough as the main symptom plus at least one symptom or sign from sputum, chest pain, dyspnoea, or wheeze were recruited to the study. Main outcomes were duration of symptoms (rated at least a slight problem) and more severe symptoms (rated at least moderately bad).
  
  
  RESULTS
  The average duration of cough (rated at least a slight problem) was 11.7 days and was shorter among children (duration -1.72 days; 95% confidence interval [CI] = -3.02 to -0.41) or in individuals with a history of fever (-1.22 days; 95% CI = -0.18 to 2.27). The duration of cough was longer among those with restricted activities on the day they saw the doctor (+0.69 days for each point of a 7-point scale). The duration of more severe symptoms was longer in those with a longer duration of symptoms prior to consultation, with a more severe cough on the day of seeing the doctor, and restriction of activities on the day of seeing the doctor.
  
  
  CONCLUSIONS
  Illness duration may be predicted from a limited number of clinical symptoms and from prior history. These findings should be subjected to validation in a separate population. To minimise expectation about rapid resolution of illness, adults who have restricted activities could be advised that they are likely to experience symptoms for longer.
authors.affiliation: University of Southampton, Division of Community Clinical Sciences, Southampton, SO16 5ST. mvm198@soton.ac.uk
authors.forename: Michael
authors.initials: M
authors.lastname: Moore
authors.forename: Paul
authors.initials: P
authors.lastname: Little
authors.forename: Kate
authors.initials: K
authors.lastname: Rumsby
authors.forename: Jo
authors.initials: J
authors.lastname: Kelly
authors.forename: Louise
authors.initials: L
authors.lastname: Watson
authors.forename: Greg
authors.initials: G
authors.lastname: Warner
authors.forename: Tom
authors.initials: T
authors.lastname: Fahey
authors.forename: Ian
authors.initials: I
authors.lastname: Williamson
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000368:Aged; D000900:Anti-Bacterial Agents / Q000008:administration & dosage*; D002648:Child; D002675:Child, Preschool; D003371:Cough / Q000628:therapy*; D005194:Family Practice; D006801:Humans; D008875:Middle Aged; D010174:Pamphlets; D010353:Patient Education as Topic / Q000379:methods*; D017060:Patient Satisfaction; D012141:Respiratory Tract Infections / Q000628:therapy*; D012720:Severity of Illness Index; D013997:Time Factors
chemical_list: D000900:Anti-Bacterial Agents