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Table 1 Results from reanalysis of UK IID GP case control study component.

From: How effective is good domestic kitchen hygiene at reducing diarrhoeal disease in developed countries? A systematic review and reanalysis of the UK IID study

   Control Case Unadjusted Adjusteda
     OR 95% CI P OR 95% CI P
Owns pet27 No 681 754 1   0.0056    0.093
  Yes 1017 939 0.816 0.707 – 0.942   0.836 0.678 – 1.030  
Shares WC No 1584 1565 1   0.260    
  Yes 91 103 1.185 0.882 – 1.593     
Shares kitchen No 1581 1557 1   0.294    
  Yes 80 89 1.350 0.863 – 1.630     
Length of work surface < 1 m 91 94 1.152 0.834 – 1.592   1.143 0.703 – 1.860  
  1 – 2 m 588 625 1.178 1.014 – 1.369   1.221 0.981 – 1.520  
  > 2 m 934 824 1   0.045 1   0.115
Owns fridge No 79 89 1.153 0.841 – 1.581     
  Yes 1612 1608 1   0.377    
Owns freezer No 75 111 1.479 1.094 – 1.999   1.219 0.761 – 1.951  
  Yes 1617 1586 1   0.011 1   0.411
Owns dishwasher No 1172 1224 1.172 1.004 – 1.368   1.178 0.932 – 1.487  
  Yes 520 473 1   0.045 1   0.170
Soak nappies in kitchen No 1657 1666 1   0.638    
  Yes 10 8 0.800 0.316 – 2.027     
Shop frequency >1 per week 410 504 1   0.649    
  1 per week 1070 920 0.697 0.591 – 0.821     
  1 per 2 weeks 124 155 1.009 0.763 – 1.334     
  1 per month 65 92 1.112 0.778 – 1.590     
  Less often 6 4 0.521 0.145 – 1.869     
Checks use by date Always 1312 1378 1   0.002 1   0.214
  Sometimes 321 229 0.696 0.575 – 0.843   0.792 0.596 – 1.051  
  Never 22 20 0.996 0.531 – 1.870   1.106 0.453 – 2.700  
Follows storage instructions Always 1208 1282 1   3.3 × 10-4 1   0.020
  Sometimes 386 306 0.719 0.602 – 0.859   0.721 0.556 – 0.933  
  Never 30 23 0.940 0.597 – 1.482   0.803 0.383 – 1.682  
Check packaging for damage when shopping Always 1363 1349 1   0.753    
  Sometimes 261 247 0.940 0.772 – 1.144     
  Never 15 17 1.197 0.589 – 2.433     
Pack frozen food together in cool container for transport Always 364 430 1   0.049 1   0.312
  Sometimes 456 380 0.697 0.569 – 0.853   0.713 0.527 – 0.965  
  Never 791 751 0.804 0.671 – 0.963   1.060 0.812 – 1.382  
Check appearance of product when shopping Always 1456 1420 1   0.572    
  Sometimes 180 181 1.034 0.825 – 1.295     
  Never 8 12 1.375 0.553 – 3.418     
Stores meat in fridge On bottom shelf 964 868 1   0.0007 1   0.0009
  Anywhere else 740 837 1.269 1.106 – 1.457   1.419 1.155 – 1.742  
Use separate chopping board for raw and cooked meats No 807 688 0.769 0.663 – 0.893   0.803 0.648 – 0.994  
  Yes 801 871 1   0.0006 1   0.044
Use separate chopping board for other raw and cooked foods No 999 860 0.772 0.664 – 0.897   0.741 0.599 – 0.919  
  Yes 607 677 1   0.0007 1   0.006
Cleans chopping board between raw and cooked foods No 52 55 1.064 0.714 – 1.584     
  Yes 1570 1496 1   0.761    
Uses same cloth for wiping all surfaces in kitchen No 810 789 1   0.884    
  Yes 854 848 1.011 0.876 – 1.165     
Normally cools foods In fridge 597 716 1   2.0 × 10-7 1   b
  In larder 77 83 0.938 0.657 – 1.339   0.651 0.388 – 1.093  
  On work surface 874 717 0.634 0.536 – 0.749   0.704 0.552 – 0.897  
Normally stores foods for eating later In fridge 1549 492 1   0.334    
  In larder 16 15 1.097 0.500 – 2.405     
  On work surface 43 56 1.360 0.900 – 2.057     
  1. aAdjusted for contact with ill person out of the home, visit overseas and lives in rented vs owner occupied home.
  2. bNot calculated by software package.