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Table 3 Odds ratios (95% confidence interval) of occurrence of Down syndrome Czech Republic, 1994–98

From: Down syndrome, paternal age and education: comparison of California and the Czech Republic

  Crude 95% CI Fully adjusted* 95% CI
   Lower Upper   Lower Upper
Sex of infants       
Boy 1    1   
Girl 0.79 0.61 1.01 0.67 0.51 0.89
Education of mother       
Primary 0.84 0.51 1.39 1.03 0.57 1.86
Vocational 0.88 0.58 1.34 1.06 0.66 1.70
Secondary 0.76 0.49 1.17 0.85 0.53 1.36
University 1    1   
P for trend 0.98    0.44   
Maternal age       
-19 1    1   
20–22 1.31 0.76 2.25 0.89 0.46 1.69
23–25 1.12 0.64 1.93 0.67 0.33 1.33
26–28 1.28 0.72 2.25 0.76 0.37 1.60
29–31 1.44 0.79 2.62 0.61 0.27 1.41
32–34 2.56 1.39 4.69 1.31 0.57 3.03
35–37 2.68 1.32 5.45 1.39 0.55 3.56
38–40 2.96 1.23 7.13 1.00 0.28 3.52
41–43 8.99 3.54 22.82 4.61 1.38 15.40
44+ 46.65 17.10 127.25 11.26 2.14 59.36
Paternal age       
-19 1    1   
20–22 0.63 0.18 2.19 0.68 0.19 2.41
23–25 1.09 0.34 3.51 1.33 0.40 4.50
26–28 1.03 0.32 3.32 1.34 0.39 4.63
29–31 0.94 0.29 3.08 1.23 0.35 4.40
32–34 1.24 0.37 4.12 1.49 0.41 5.46
35–37 1.95 0.58 6.53 1.98 0.52 7.44
38–40 2.21 0.63 7.69 2.02 0.51 7.96
41–43 2.10 0.54 8.14 1.68 0.38 7.42
44+ 3.03 0.82 11.20 2.03 0.47 8.77
  1. Note: * -Adjusted for all variables in the Table.