Table 2. Prevalence of MGUS by smoking status.

Race	No. of persons with MGUSa	Smoking status	Prevalence of MGUS (%)	Lower limit of 95% CI	Upper limit of 95% CI
All persons	20	Never	0.22	0.11	0.43
	14	Former	0.76	0.33	1.76
	28	Current	0.51	0.24	1.13
Whites	3	Never	0.18	0.056	0.58
	5	Former	0.75	0.27	2.07
	1	Current	0.08	0.01	0.62
Blacks	11	Never	0.53	0.29	0.96
	3	Former	1.10	0.33	3.61
	20	Current	2.16	1.38	3.37
Mexican-American	5	Never	0.23	0.08	0.67
	6	Former	1.24	0.51	3.00
	5	Current	0.76	0.30	1.92

Abbreviations: CI, confidence interval; MGUS, monoclonal gammopathy of undetermined significance.

^aBecause of missing smoking data there are 62 persons with MGUS in this table.