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Table 4 Associations between characteristics of the births and IM in the child

From: Maternal and perinatal factors associated with hospitalised infectious mononucleosis in children, adolescents and young adults: record linkage study

  Number and % of each group of children Chi sq (df) with p value below
   IM all ages IM 11+ No IM All IM (vs no IM) IM aged 11+ (vs no IM)
   No. % No. % No. %   
No. of babies delivered 1 223 99.1 156 100 243046 97.8 1.7(1) 3.5(1)
  2+ 2 0.9 0 0 5388 2.2 0.2 0.06
Birth weight (g) 1000-2999 61 27.2 44 28.4 58492 23.6 1.7(2) 2.5(2)
  3000-3999 144 64.3 96 61.9 168005 67.9 0.4 0.3
  4000-5499 19 8.5 15 9.7 21132 8.5   
Gestational age 24-37w 19 9 11 7.4 21893 10.1 0.7(2) 2.2(2)
  38-41w 170 80.2 119 80.4 173698 80.4 0.7 0.3
  42-47w 23 10.9 18 12.2 20544 9.5   
Breastfeeding no 31 25.6 21 27.6 50935 30.3 1.2(1) 0.3(1)
  yes 90 74.4 55 72.4 117274 69.7 0.3 0.6
Caesarian birth no 209 92.9 147 94.2 223584 92.6 0(1) 0.6(1)
  yes 16 7.1 9 5.8 18009 7.5 0.8 0.4
Forceps no 182 80.9 126 80.8 209918 86.9 7.1*(1) 5.1*(1)
  yes 43 19.1 30 19.2 31675 13.1 0.008 0.02
Presentation vertex 112 93.3 72 96 158190 95 0.7(1) 0.2(1)
  other 8 6.7 3 4 8303 5 0.4 0.7
Apgar 1 score 1 to 5 19 9.6 15 10.6 21337 9.5 2.1(2) 2(2)
  6 to 8 65 33 47 33.1 64404 28.5 0.4 0.4
  9 to 10 113 57.4 80 56.3 140154 62   
Apgar 5 score 1 to 5 0 0 0 0 884 0.6 0.6(2) 0.4(2)
  6 to 8 3 3 2 2.9 4226 2.8 0.7 0.8
  9 to 10 97 97 66 97.1 148738 96.7   
Gender male 113 50.2 74 47.4 127716 51.4 0.1(1) 1(1)
  female 112 49.8 82 52.6 120711 48.6 0.7 0.3
Pre-eclampsia no 195 86.7 133 85.3 224165 90.3 3.3(1) 4.4*(1)
  yes 30 13.3 23 14.7 24220 9.8 0.07 0.04
  1. * Significant difference, with exact p value given
  2. df = degrees of freedom