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Table 2 Associations between mothers' characteristics 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. %   
Maternal IM no 222 98.7 154 98.7 243831 98.2 0.3(1) 0.3(1)
  yes 3 1.3 2 1.3 4554 1.8 0.6 0.6
Maternal age 14-24 88 39.1 66 42.3 86456 34.8 2.4(1†) 4.4(1†)
  25-34 124 55.1 82 52.6 142815 57.6 0.1 0.04
  35+ 13 5.8 8 5.1 18839 7.6   
Maternal social class 1,2 (higher) 53 28.3 40 28.8 68191 35.8 5.6*(1†) 3.5(1†)
  3 90 48.1 67 48.2 86779 45.6 0.02 0.06
  4,5 (lower) 44 23.5 32 23 35466 18.6   
Maternal marital status not married 6 2.7 4 2.6 23933 9.7 12.6*(1) 9.0*(1)
  married 219 97.3 152 97.4 224042 90.4 0.0004 0.003
Maternal smoking no 72 72 47 71.2 110889 76.4 1.1(1) 1(1)
  yes 28 28 19 28.8 34217 23.6 0.3 0.3
Parity 0 87 38.7 61 39.1 104123 42 1(1) 0.5(1)
  1 or more 138 61.3 95 60.9 144076 58.1 0.3 0.5
Maternal blood group A 93 50.3 64 47.8 100917 48.9 0.1(1) 0.07(1)
  O 92 49.7 70 52.2 105299 51.1 0.7 0.8
Maternal rhesus status positive 171 82.2 123 82.6 196481 83.2 0.1(1) 0(1)
  negative 37 17.8 26 17.5 39768 16.8 0.7 0.8
  1. * Significant difference, with exact p value given
  2. † Chi square for trend
  3. df = degrees of freedom