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Table 1 Descriptive statistics of breast cancer cases and matched controls by factors used for adjustment

From: Space-time clusters of breast cancer using residential histories: A Danish case–control study

Descriptive statistics Cases Controls  
Full data set 3138 6276  
Women with missing data on adjustment variables 1060 2121  
Women with data on adjustment variables 2078 4155  
Age at diagnosis/index datea 62.6 (41.5 - 85.9) 62.6 (41.5 - 85.9)  
Adjustment variables    p-value
Child birth yes/no 1838/240 (88%/12%) 3734 / 421 (90%/10%) 0.09d
Number of children    0.01e
  0 240 (12%) 421 (10%%) -
  1 328 (16%) 623 (15%) -
  2 953 (46%) 1910 (46%) -
  ≥3 557 (27%) 1201 (29%) -
Age at first child birtha,b 24.1 (18.6 - 33.5) 23.6 (18.3 - 32.7) 0.0004e
Area-level educationa,c 6.5 (1–31) 5.9 (1–28.2) 0.007e
Area-level income in 100.000 DKKa 4.9 (2.9 - 7.6) 4.8 (2.8 - 7.4) 0.052e
  1. aNumbers are medians (5% - 95% percentiles).
  2. bAmong parous women.
  3. cPercentage of households in the area having the highest possible educational level.
  4. DKK: the Danish currency.
  5. dUnivariate χ2-test of categorical variable.
  6. eUnivariate Wilcoxon test of linear variables.