Table 3.

Factors for Alzheimer dementia among different usages of antibiotics by using Fine and Gray's competing risk model.

Medications		Adjusted HR	95% CI	95% CI	P
Macrolides	Without Chlamydia pneumoniae	Reference
	With Chlamydia pneumoniae
	Without Macrolides	2.177	1.865	2.468	<0.001
	with Macrolides 1–7 days	1.483	1.069	1.825	0.003
	with Macrolides 8–14 days	1.592	1.276	1.899	<0.001
	with Macrolides≥15 days	1.198	0.929	1.487	0.304
Fluoroquinolones	Without Chlamydia pneumoniae	Reference
	With Chlamydia pneumoniae
	Without Fluoroquinolones	1.996	1.395	2.896	<0.001
	With Fluoroquinolones 1-7 days	1.506	1.283	1.883	<0.001
	With Fluoroquinolones 8-14 days	1.385	1.106	1.796	0.001
	With Fluoroquinolones≥15 days	1.302	0.973	1.656	0.391

PYs, Person-years; Adjusted HR, Adjusted variables listed in the table; CI, confidence interval; P, Chi-square/Fisher exact test on category variables and t-test on continue variable.