Table 3. Multiple logistic regression of diarrheoa cases from four referral hospitals, by selected pathogens, Sydney, Australia, 2007–2010 (n = 301).

Characteristics	Odds ratio	95% confidence interval	P-value
Blastocystis spp.
MSM status	2.3	1.0–5.4	0.055
Co-morbidity surgery	2.1	0.9–4.7	0.068
Age group (years) (Ref > 75)
< 5	0.0	Undefined	Undefined
5–12	0.0	Undefined	Undefined
13–24	0.5	0.1–5.1	0.582
25–49	3.0	0.9–9.9	0.070
50–75	3.1	1.0–9.8	0.050
Dientamoeba fragilis
MSM status	12.8	1.3–130.7	0.031
Co-morbidity transplant	10.1	0.7–146.2	0.089
Co-morbidity cancer	13.8	1.6–122.1	0.018
Clostridium difficile
Age group years (Ref > 75)
< 5	0.0	Undefined	Undefined
5–12	0.0	Undefined	Undefined
13–24	0.0	Undefined	Undefined
25–49	0.0	Undefined	Undefined
50–75	0.8	0.4–1.8	0.611
Gender (Ref = Male)	0.4	0.2–0.9	0.031
Co-morbidity surgery	2.2	1.1–4.6	0.030
Co-morbidity HIV	0.4	0.1–1.1	0.070
Co-morbidity cancer	0.3	0.1–0.9	0.030
MSM status	0.3	0.1–1.0	0.051
Antibiotic use/chemotherapy	6.3	3.2–12.2	< 0.001
Chronic GI	2.4	1.1–5.3	0.035
Suspect food	0.2	0.0–1.5	0.113
Campylobacter spp.
MSM status	0.2	0.0–0.7	0.011
Co-morbidity transplant	7.0	1.6–30.6	0.010
Co-morbidity cancer	7.5	2.1–26.6	0.002
Antibiotic use/chemotherapy	0.1	0.0–0.2	< 0.001
Age group (years) (Ref > 75)
< 5	0.0	Undefined	Undefined
5–12	0.0	Undefined	Undefined
13–24	2.5	0.8–7.4	0.101
25–49	1.8	0.7–4.4	0.206
50–75	0.3	0.1–0.9	0.038
N-T Salmonella spp.
MSM status	0.2	0.0–1.8	0.154
Co-morbidity surgery	0.2	0.0–1.4	0.094
Age group (years) (Ref > 75)
< 5	0.0	Undefined	Undefined
5–12	0.0	Undefined	Undefined
13–24	14.4	2.4–85.8	0.003
25–49	3.6	0.8–16.9	0.102
50–75	0.7	0.1–4.6	0.693
Gender (Ref = Male)	7.4	2.2–24.8	0.001
Shigella spp.
MSM status	5.0	1.6–16.0	0.007
Co-morbidity HIV	3.3	1.0–10.9	0.055
Suspect food	3.5	1.1–11.2	0.037

GI, gastrointestinal illness; MSM, men who have sex with men; and Ref, reference group.