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Table 2 Baseline clinical characteristics

From: Antibiotic prescription and food allergy in young children

Characteristic Cases (n = 1504) Controls (n = 5995) p value
Male, % 55.9 55.8 0.98
Month of birth, %
 Jan 8.58 8.56 1.00
 Feb 7.85 7.86
 Mar 7.91 7.91
 Apr 6.32 6.34
 May 7.58 7.56
 Jun 8.98 8.96
 Jul 10.7 10.68
 Aug 8.44 8.46
 Sep 10.04 10.06
 Oct 7.78 7.77
 Nov 6.38 6.41
 Dec 9.44 9.46
Year of birth, %
 2007 25.9 25.9 1.00
 2008 33.4 33.5
 2009 40.7 40.6
Race/ethnicity, %
 Caucasian 42.6 42.7 1.00
 AA 40.5 40.6
 Hispanic 8.8 8.8
 American Indian 0.1 0.1
 Asian 0.5 0.5
 Unknown 7.3 7.2
 Other 0.2 0.1
Birth weight, gramsa 3168.1 3133.5 0.06
Asthma, % 8.4 2.0 <.001
Atopic dermatitis, % 32.8 6.7 <.001
Wheeze, % 17.1 7.3 <.001
Vaginal birth, % 60.0 62.6 0.05
Breastfeeding at hospital discharge, % 56.3 49.7 <.001
WIC status, % 80.6 79.7 0.42
NICU admission, % 6.6 6.7 0.94
Tobacco pre-pregnancy, % 17.4 19.7 0.04
Tobacco during pregnancy, % 14.0 16.5 0.02
Urban residence, % 74.2 71.2 0.02
Gestational age, weeksa 38.3 38.2 0.07
Maternal age, yearsa 24.5 24.1 0.01
Diabetes (gestational), % 4.6 4.5 0.91
Diabetes (pre-pregnancy), % 2.1 1.0 0.001
Antibiotics during labor/delivery, % 22.8 21.0 0.13
Antibiotics received due to abnormal conditions at birth, % 3.6 3.3 0.65
Steroids during childbirth, % 0.6 0.9 0.21
  1. aNumeric variables presented as mean