TABLE 1.

Odds ratios for age categories and sex in a multivariable model comparing cases of Campylobacter coli with C. jejuni, controlled for by area of residence (χ² P = 0.003)^a

Variable	Odds ratio	95% confidence interval
Age (yr)
0-24 (baseline)	1
25-44	1.66	0.85-3.23
45-64	1.86	0.95-3.63
>65	3.23	1.63-6.42
Female sex	1.54	1.03-2.32
Rural residence	1.06	0.70-1.60

^aCases of C. coli were 3.23 times more likely to be over 65 years old compared with cases of C. jejuni (in relation to number of cases in the baseline category). Figures in bold show results statistically significant at a 95% level.