Table 2.

Claims-level analysis of factors associated with discarded percentage

Covariatesa	Estimate (95% CI), %	P b
High-deductible plan	0.01 (−0.7 to 0.7)	.98
Age [Reference: age <50 y]
50-59 y	−0.5 (−1.3 to 0.2)	.18
≥60 y	−0.1 (−1.0 to 0.8)	.84
Weight [Reference: >200 lb (90.7 kg)]
<150 lb (68.0 kg)	5.5 (4.7 to 6.4)	<.001
150-199 lb (68.0-90.3 kg)	1.1 (0.3 to 1.9)	.008
Place of service [Reference: office]
Hospital	0.4 (−2.2 to 1.1)	.20
Cancer type [Reference: GI]
Breast	1.65 (−0.1 to 3.4)	.06
Genitourinary	−0.03 (−3.1 to 3.0)	.98
Gynecological	−1.4 (−3.2 to 0.3)	.11
Lung	−4.8 (−7.5 to −2.0)	.001
Lymphoma	−0.5 (−2.3 to 1.4)	.61
Other blood cancers	−0.4 (−3.5 to 2.8)	.81
Other cancer	0.4 (−1.0 to 1.8)	.56
Region [Reference: Northeast]
North Central	−0.7 (−1.7 to 0.4)	.22
South	0.4 (−0.6 to 1.4)	.43
West	0.6 (−0.4 to 1.7)	.25

^aOther covariates include the list of weight-based antineoplastic drugs. CI = confidence interval; GI = gastrointestinal.

^b P values from Wald tests; all P values were 2-sided.