PhD thesis - University of Hertfordshire Research Archive

Table A3.1 Reported epidemiological features in published case-control
studies of sporadic Campylobacter infection.
Factor
Publication area (%)
80s (12)
Decade (N)
90s (10) 00s (13)
Total
N America 58 0 38 34
Rest of Europe 33 20 46 34
UK 8 60 8 23
Australasia
Study population
0 20 8 9
All 75 80 77 77
Adults 17 20 0 11
Infants & children 8 0 23 11
Percentage indigenous 9 40 62 38
Mean study length (months) 14 7 12 11
Mean sample size 326 456 565 452
Mean number of variables 19 32 106 55
Mean exposure period 7 10 10 9
Mean interview lag 10 10 14 11
Percentage matching 83 100 100 94
Percentage multivariate analysis
Foreign travel
17 50 92 54
†
% enquiry 60 83 100 76
% risk factor
Poultry variables
33 33 50 39
% enquiry – any 75 80 85 80
% enquiry – ch* 58 70 77 69
Mean no. variables – any 4 9 10 8
Mean no. variables – ch* 4 6 8 6
% risk factor – any 89 63 73 75
% risk factor – ch*
Other (non-poultry) meats
86 43 50 58
% enquiry 42 70 92 69
Mean no. variables 8 5 6 6
% risk factor
Dairy
40 29 42 38
% enquiry 40 100 100 80
% risk factor
Water
80 51 31 46
% enquiry 42 60 77 60
% risk factor
Animal contact
80 33 40 48
% enquiry 42 60 77 60
% risk factor 80 33 40 48
Total risk factors identified 44 41 55 140
Mean risk factors identified 4 4 4 4
†
, Excludes indigenous-only studies; *, chicken
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