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Table 2 Demographic Variables in the Two Study Groups

From: Infants hospitalized for Bordetella pertussis infection commonly have respiratory viral coinfections

Demographic variables Pertussis
(N = 28)
Pertussis + Virus
(N = 25)
P Values
Boys 17 (60.7%) 17 (68%) 0.396*
Median age at hospitalization in days (range) 51.5 (17–102) 62 (22–109) 0.044
Gestational age in weeks (range) 39 (35–41) 39 (37–41) 0.105
Birth weight in Kg (range) 3.345 (1.940–4.450) 3.250 (2.500–4.100) 0.618
Cesarean section 10 (35.7%) 8 (32%) 0.503*
Breastfeeding at recovery 13 (46.4%) 19 (76%) 0.048*
Months breastfeeding 1.02 (0–2.14) 1.91 (0.27–3.58) 0.004
Presence of siblings 16 (57.1%) 19 (76%) 0.123*
Number of cohabitants ≥4 19 (67.9%) 22 (88%) 0.076*
Passive smoke 10 (35.7%) 11 (44%) 0.798*
Co-habitants with respiratory symptoms 21 (75%) 22 (88%) 0.197*
  1. *by χ-square test, by Mann-Whitney test
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