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Table 2 Main characteristics of influenza or I-LSs episodes registered in the questionnaire

From: Influenza and influenza-like syndromes: the subjects’ beliefs, the attitude to prevention and treatment, and the impact in Italian general population

  Total
N = 1,202
Respondents with influenza or I-LSs episodes 688 (57.2%)
Episodes per year ─ mean (range) 1.81 (1.55; 2.06)
 1 episode ─ N (%) 356 (52.4%)
 2–3 episodes ─ N (%) 298 (43.9%)
  > 3 episodesa ─ N (%) 25 (3.7%)
Duration ─ mean (range) 5.27 (2.41; 8.12)
  < 7 days ─ N (%) 526 (76.5%)
 7–15 days ─ N (%) 162 (23.5%)
Subjects requiring GP ─ N (%) 383 (55.7%)
Subjects requiring ER ─ N (%) 19 (2.8%)
Hospitalizations ─ N (%) 6 (0.9%)
  < 7 days ─ N (%) 3 (50.0%)
 16–30 days ─ N (%) 3 (50.0%)
  1. I-LSs influenza-like syndromes, GR general practitioner, ER emergency room
  2. aA maximum number of 6 episodes per year was assumed; this limit was estimated fitting a Poisson distribution on the frequencies recorded in the questionnaires