Table 4.

Number of Site-specific Cancer Cases, Age- and Time-adjusted Poisson Rate Ratios, and 95% Confidence Intervals for Female Cosmetology Workers Licensed as Cosmetologists or Manicurists in California, 1988–2005

Cancer Sites	SEER Codes	All Licenseesa			Cosmetologists			Manicurists
		No. of Cases	Rate Ratiob,c	95% CI	No. of Cases	Rate Ratiob,c	95% CI	No. of Cases	Rate Ratiob,c	95% CI
All sites	20010–37000	9,044	0.84	0.83, 0.86	6,239	0.84	0.82, 0.86	2,805	0.87	0.84, 0.90
Bladder	29010	63	0.90	0.70, 1.16	43	0.91	0.67, 1.22	20	0.90	0.58, 1.39
Brain	31010	115	0.78	0.65, 0.94	74	0.73	0.58, 0.91	41	0.91	0.67, 1.24
Breast	26000	3,455	0.84	0.81, 0.87	2,435	0.85	0.82, 0.89	1,020	0.81	0.76, 0.86
Leukemia	35011–35043	168	0.89	0.76, 1.04	128	0.98	0.83, 1.17	40	0.68	0.50, 0.93
Lung	22030	777	0.87	0.81, 0.94	496	0.81	0.74, 0.89	281	1.00	0.89, 1.25
Melanoma of the skin	25010	477	0.86	0.78, 0.94	321	0.83	0.74, 0.93	156	0.92	0.78, 1.07
Multiple myeloma	34000	83	1.05	0.85, 1.30	59	1.09	0.84, 1.41	24	0.97	0.65, 1.45
Non-Hodgkin's lymphoma	33041–33042	328	0.92	0.82, 1.02	220	0.89	0.78, 1.02	108	0.98	0.81, 1.18
Ovary	27040	333	0.81	0.72, 0.90	239	0.83	0.73, 0.95	94	0.74	0.61, 0.91
Stomach	21020	113	0.92	0.76, 1.10	82	0.97	0.78, 1.20	31	0.81	0.57, 1.15
Thyroid	32010	503	0.99	0.91, 1.08	350	1.00	0.90, 1.11	153	0.98	0.84, 1.15
Uterus	27020–27030	459	0.75	0.68, 0.82	308	0.73	0.65, 0.81	151	0.80	0.68, 0.94

Abbreviations: CI, confidence interval; SEER, Surveillance, Epidemiology, and End Results.

^aIncludes both licensed cosmetologist and manicurist licensees.

^bRate ratios from Poisson regression models adjusted by 5-year age groups and time periods (1988–1994, 1995–1999, and 2000–2005).

^cPerson-years adjusted for age-specific out-migration.