Table 1

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


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



aAdjusted for contact with ill person out of the home, visit overseas and lives in rented vs owner occupied home.

bNot calculated by software package.

Stenberg et al. BMC Public Health 2008 8:71   doi:10.1186/1471-2458-8-71