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Table 1 Characteristics of the study subjects

From: Incidence of acute respiratory infections in preschool children in an outpatient setting before and during Covid-19 pandemic in Lombardy Region, Italy

  CHILDREN
  N %
Male gender (n = 484) 249 51.8
Age group
 0–1 years 131 27.1
 1–2 years 111 22.9
 2–3 years 70 14.5
 3–4 years 62 12.8
 4–5 years 61 12.6
 5–6 years 49 10.1
Mode of delivery (n = 467)
 Vaginal 340 72.8
 Caesarean 127 27.2
Type of feeding (n = 462)
 Excusive breastfeeding 201 43.5
 Exclusive Formula 83 18.0
 Mixed 178 38.5
Vaccination a
 Hexavalent (n = 448) 438 97.8
 Pneumococcal conjugate (n = 448) 410 91.5
 MMR (n = 450) 323 71.8
 Meningococcal B (n = 448) 336 75.0
 Meningococcal C (n = 449) 324 72.2
 Rotavirus (n = 448) 211 47.1
 Influenza (2020–2021 season) (n = 248) 151 60.9
 Influenza (past seasons before 2020) (n = 463) 77 16.6
Allergies (n = 470)
 Inhalant allergy 8 1.9
Indirect smoke (n = 472)
 Yes 169 35.8
 No 303 64.2
Day care attendance (n = 471)
 Yes 404 85.8
 No 67 14.2
Meal at Kindergartend (n = 355)
 Yes 345 97.2
 No 10 2.8
Afternoon nap at Kindergartend (n = 353)
 Yes 205 58.1
 No 148 41.9
Use of pacifiers (n = 456)
 Yes 282 61.8
 No 174 38.2
Siblings (n = 468)
 0 161 34.4
 1 252 53.8
  ≥ 2 55 11.8
  1. MMR measles, mumps and rubella vaccine. a At least 1 dose of vaccine