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Table 2 Questionnaire response rates by sex-specific cognition score quintiles

From: Early life factors, childhood cognition and postal questionnaire response rate in middle age: the Aberdeen Children of the 1950sstudy

  Male (n = 5,742) Female (n = 5,540)
  Test score      Test score     
  Mean Range Number Response rate (%) Odds ratio (95% CI) Mean Range Number Response rate (%) Odds ratio (95% CI)
Cognition at 7             
Lowest quintile 84 50, 93 1,111 48.2 1.00*   84 50, 93 1,006 52.9 1.00*  
2nd lowest 98 94, 102 1,046 54.0 1.26 (1.07 to 1.50) 98 94, 103 1,058 60.3 1.35 (1.14 to 1.61)
Middle 106 103, 110 1,128 59.3 1.57 (1.33 to 1.86) 107 104, 111 1,023 72.7 2.38 (1.97 to 2.87)
2nd highest 115 111, 120 1,126 67.4 2.23 (1.87 to 2.65) 116 112, 121 1,099 73.6 2.49 (2.06 to 3.00)
Highest quintile 129 121, 153 1,173 70.3 2.55 (2.14 to 3.05) 130 122, 166 1,080 78.4 3.24 (2.66 to 3.95)
Missing    158 50.0 1.08 (0.77 to 1.50)    274 66.1 1.73 (1.31 to 2.29)
Cognition at 9             
Lowest quintile 85 50, 95 1,047 45.7 1.00*   89 60, 98 1,002 54.3 1.00*  
2nd lowest 102 96, 106 998 57.2 1.59 (1.34 to 1.90) 104 99, 107 921 62.4 1.40 (1.17 to 1.68)
Middle 111 107, 115 1,207 60.5 1.82 (1.54 to 2.16) 111 108, 115 1,078 68.9 1.87 (1.56 to 2.24)
2nd highest 119 116, 124 1,049 64.9 2.20 (1.84 to 2.63) 119 116, 123 1,047 74.5 2.46 (2.03 to 2.98)
Highest quintile 135 125, 174 1,139 72.2 3.09 (2.57 to 3.71) 133 124, 176 1,110 79.1 3.19 (2.61 to 3.88)
Missing    302 49.7 1.17 (0.91 to 1.52)    382 60.5 1.29 (1.01 to 1.64)
Cognition at 11             
Lowest quintile 78 54, 86 920 45.5 1.00*   80 47, 87 843 52.4 1.00*  
2nd lowest 91 86, 95 903 54.6 1.44 (1.19 to 1.73) 92 88, 97 890 63.3 1.56 (1.29 to 1.89)
Middle 99 96, 103 934 63.6 2.09 (1.73 to 2.52) 101 97, 104 845 74.1 2.59 (2.10 to 3.20)
2nd highest 108 104, 113 931 67.2 2.45 (2.02 to 2.98) 109 105, 114 881 74.6 2.66 (2.16 to 3.28)
Highest quintile 121 113, 144 922 71.4 2.98 (2.44 to 3.64) 121 114, 146 874 78.6 3.33 (2.68 to 4.15)
Missing    1,132 56.7 1.57 (1.32 to 1.87)    1,207 64.3 1.63 (1.37 to 1.95)
  1. *p < 0.05 for the score test for trend (missings were not included).
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