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Table 4 Standardized difference of residences for premenopausal and postmenopausal breast cancer cases and controls by decades;

From: Assessing spatio-temporal variability of risk surfaces using residential history data in a case control study of breast cancer

  Decades Case Control Standardized differences No. of areasa > 2SD No. of areasa > critical valuesb
Premenopausal 1940s 36 86 -2.35–2.12 2 0
  1950s 222 461 -2.45–3.15 9 0
  1960s 341 633 -4.02–3.78 21 2
  1970s 514 1025 -3.89–3.96 35 2
  1980s 552 1005 -4.26–4.50 24 3
  1990s 457 723 -4.06–4.14 32 5
Postmenopausal 1930s 389 676 -2.51–2.62 24 0
  1940s 809 1253 -3.01–3.04 23 0
  1950s 1158 1968 -3.66–2.91 22 0
  1960s 1247 2072 -4.18–2.99 18 0
  1970s 1100 1839 -4.98–3.13 21 0
  1980s 960 1651 -3.84–2.85 23 0
  1990s 943 1542 -4.40–3.57 22 0
  1. a Areas refer to the rectangular grid overlaid on to the study area, b Critical values of 3.88 for premenopausal and 3.71 for postmenopausal residences.