Table 3.

Poisson Multivariate Models of Therapeutic and Nontherapeutic Clinical Trial Accrual to Cancer Case Ratio

	Therapeutic			Nontherapeutic
	β Coefficient (SD)	ACR*	P Value	β Coefficient (SD)	ACR*	P Value
Age (y)
< 20	−0.04 (0.09)	0.96	.64	0.31 (0.12)	1.37	.009
20–64	Reference	1.00	–	Reference	1.00	–
> 64	0.12 (0.04)	1.12	.002	–0.14 (0.05)	0.87	.007
Sex
Male	Reference	1.00	–	Reference	1.00	–
Female	0.29 (0.04)	1.33	< .001	0.26 (0.05)	1.29	< .001
Race
White	Reference	1.00	–	Reference	1.00	–
Black	−0.31 (0.06)	0.73	< .001	−0.15 (0.08)	0.86	.05
Other	−0.01 (0.10)	0.99	.90	−0.36 (0.15)	0.70	.02
County poverty (%)
< 16.2	Reference	1.00	–	Reference	1.00	–
16.2	0.13 (0.08)	1.14	.10	−0.13 (0.13)	0.88	.31
Place of residence
Non-Baltimore City catchment area†	Reference	1.00	–	Reference	1.00	–
Baltimore City	−0.44 (0.10)	0.64	< .001	0.02 (0.15)	1.02	.89
Non–catchment area‡	−0.27 (0.05)	0.76	< .001	−0.33 (0.06)	0.72	< .001
Cancer site
Other	Reference	1.00	–	Reference	1.00	–
GI/Prostate	0.58 (0.05)	1.79	< .001	0.03 (0.06)	1.03	.61
Hematologic	2.03 (0.04)	7.60	< .001	0.52 (0.07)	1.68	< .001

Abbreviation: ACR, accrual to cancer case ratio.

^*Clinical trial accrual to cancer case ratio is adjusted for all other variables in the model.

^†57 Counties clustering around Baltimore City.

^‡All other counties in the continental United States.