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Table 2 Summary of matching variables

From: Residential traffic exposure and children's emergency department presentation for asthma: a spatial study

  Cases Controls Total
  N % n % n %
All subjects 603 33 1206 66 1809 100
Gender       
   Male 341 57 682 57 1023 57
   Female 262 43 524 43 786 43
Age strata       
   0-4 years 224 37 448 37 672 37
   5-9 years 176 29 352 29 528 29
   10-14 years 112 19 224 19 336 19
   15-19 years 91 15 182 15 273 15
Season       
   Summer 110 18 220 18 330 18
   Autumn 172 29 344 29 516 29
   Winter 192 32 384 32 576 32
   Spring 129 21 258 21 387 21