Table 1. Population based cohort studies assessing the relative risk of TB in dialysis patients.

Author, year of publication, reference	Location	Background TB incidence 100,0000/year	Number of dialysis patients	Relative Risk(95% CI)	adjusted Relative Risk(95% CI)	potential confounders Relative Risk is adjusted for	stratification by
Ahmed et al, 2004, [10]	California, USA	11.9	2,809	11.3 (*)	not done	none	none
Chou et al, 2001, [11]	Taiwan	71.1	24,553	6.9 (*)	not done	none	gender, age
Simon et al, 1999, [12]	New Jersey, USA	10.7–10.8	4,831	6.9 (*)	3.4 (*)	age, race	none
Chia et al, 1998, [13]	British Columbia, Canada	10.1**	886	*	25.3 (22.9–31.5)	age	none

*information missing.

**for age 20–60 years.