Table 4.

Risk factors in common across groups following multivariate analysis.

	PSS (n = 1165)	EUCLID (n = 721)	Combined (n = 1886)
	OR (95% CI)	OR (95% CI)	OR (95% CI)
Age ≥ 65	1.6 (1.2–2.3)	2.5 (1.6–3.7)	1.9 (1.5–2.5)
Number of antibiotics	1.3 (1.1–1.4)	1.2 (1.1–1.4)	1.2 (1.1–1.3)
Prior hospital admission	1.9 (1.4–2.6)	1.6 (1.0–2.4)	1.7 (1.4–2.1)

Controls with evidence of prior or subsequent CDI within 8 weeks of the index sample, and any cases with evidence of CDI positive within 8 weeks prior to the index sample were removed from multivariate analysis.