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Table 3 Main characteristics of influenza or I-LSs episodes registered in the questionnaire according to vaccination and smoking status

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

  Did you receive annual vaccination? Smoking status
  Never
N = 685 (57%)
Sometimes
N = 335 (30%)
Yes
N = 170 (14%)
p Smokers
N = 243 (20%)
Never smoke
N = 807 (67%)
Ex-smokers
N = 150 (13%)
p
Respondents with influenza or I-LSs episodes 393 (57.4%) 185 (55.2%) 102 (60.0%) 0.58 136 (56.0%) 470 (58.2%) 80 (53.3%) 0.49
Episodes per year ─ mean (range) 1.83 (1.57; 2.10) 1.77 (1.52; 2.02) 1.72 (1.49; 1.95) 0.63 1.78 (1.53; 2.03) 1.82 (1.56; 2.08) 1.73 (1.49; 1.96) 0.94
 1 episode ─ N (%) 198 (50.8%) 97 (53.0%) 58 (58.6%)   73 (54.1%) 239 (51.6%) 44 (55.7%)  
 2–3 episodes ─ N (%) 177 (45.4%) 81 (44.3%) 37 (37.4%)   57 (42.2%) 206 (44.5%) 33 (41.8%)  
  > 3 episodesa ─ N (%) 15 (3.8%) 5 (2.7%) 4 (4.0%)   5 (3.7%) 18 (3.9%) 2 (2.5%)  
Duration ─ mean (range) 5.16 (2.33; 7.99) 5.20 (2.36; 8.04) 5.71 (2.76; 8.65) 0.29 5.10 (2.28; 7.92) 5.27 (2.42; 8.13) 5.56 (2.65; 8.48) 0.59
  < 7 days ─ N (%) 306 (77.9%) 143 (77.3%) 72 (70.6%)   107 (78.7%) 359 (76.4%) 58 (72.5%)  
 7–15 days ─ N (%) 87 (22.1%) 42 (22.7%) 30 (29.4%)   29 (24.4%) 111 (23.6%) 22 (27.5%)  
Subjects requiring GP ─ N (%) 212 (53.9%) 107 (57.8%) 60 (58.8%) 0.54 74 (54.4%) 269 (57.2%) 39 (48.8%) 0.35
Subjects requiring ER ─ N (%) 8 (2.0%) 7 (3.8%) 4 (3.9%) 0.37 4 (5.7%) 12 (4.5%) 3 (7.7%) 0.83
Hospitalizations ─ N (%) 1 (0.3%) 1 (0.5%) 4 (3.9%) 0.08 0 (0.0%) 3 (0.6%) 3 (3.8%) 0.01
  < 7 days ─ N (%) 0 (0%) 0 (0%) 3 (75.0%)   0 (0.0%) 1 (33.3%) 2 (66.7%)  
 16–30 days ─ N (%) 1 (100.0%) 1 (100.0%) 1 (25.0%)   0 (0.0%) 2 (66.7%) 1 (33.3%)  
  1. I-LSs influenza-like syndromes, GR general practitioner, ER emergency room
  2. aA maximum number of 6 events per year was assumed; this limit was estimated fitting a Poisson distribution on the frequencies recorded in the questionnaires