Table 3.

Factors Associated With Receiving at Least One Tumor Marker Test in 2 Years After Diagnosis

Factor	OR	95% CI
Age*
Mean age at diagnosis	0.96†	0.96 to 0.97
Year*
Diagnosis year	1.05†	1.04 to 1.07
Comorbidity*
Klabunde Index‡	0.95	0.90 to 1.01
Race/ethnicity (v white)
African American	0.84†	0.76 to 0.93
American Indian/Alaskan native	0.81	0.49 to 1.33
Asian/Pacific Islander	0.99	0.86 to 1.13
Hispanic	1.01	0.90 to 1.14
Other/unknown	0.87	0.62 to 1.23
Tumor stage (v stage 1)
2	1.48†	1.41 to 1.55
3	2.19†	1.97 to 2.43
ER status (v negative)
Positive	0.98	0.90 to 1.07
Borderline	1.33	0.77 to 2.27
Unknown	0.82	0.59 to 1.13
PR status (v negative)
Positive	0.92§	0.86 to 0.98
Borderline	0.93	0.73 to 1.19
Unknown	1.07	0.78 to 1.47
Geographic region (v San Francisco)
Connecticut	2.14†	1.85 to 2.47
Detroit	1.00	0.86 to 1.15
Hawaii	1.07	0.84 to 1.37
Iowa	0.36†	0.30 to 0.43
New Mexico	1.12	0.92 to 1.36
Seattle	1.75†	1.52 to 2.02
Utah	0.91	0.75 to 1.09
Atlanta	1.36†	1.15 to 1.61
San Jose	0.56†	0.46 to 0.69
Los Angeles	7.72†	6.67 to 8.92
Rural Georgia	0.28†	0.15 to 0.56
Greater California	2.55†	2.24 to 2.89
Kentucky	1.17§	1.01 to 1.35
Louisiana	0.90	0.77 to 1.05
New Jersey	3.49†	3.07 to 3.96
Urban/rural status (v large metropolitan area with 1M+ population)
Metropolitan (250,000+)	0.88†	0.83 to 0.94
Large urban (20,000+)	0.80†	0.73 to 0.89
Small urban (2,500+)	0.75†	0.67 to 0.84
Rural (< 2,500)	1.30§	1.06 to 1.58

Abbreviations: ER, estrogen receptor; OR, odds ratio; PR, progesterone receptor.

^*Analyzed by using the natural log transformation and adjusted for age, diagnosis year, Klabunde index, race, tumor stage, tumor receptor status, geographic region, and urban/rural status.

^†P < .001, Wald χ².

^‡Klabunde Index value missing for 848 participants.

^§P < .05, Wald χ².