Table 2.

Data analysis: identification of factors associated with missing value and probability of HER2.

Variable	Missing HER2 Value			Missing HER2 Probability
	ORa	95% CIb	pc	OR	95% CI	p
Age	0.987	(0.983, 0.991)	<0.0001	1.031	(1.026, 1.035)	<0.0001
Black	1.187	(0.983, 1.433)	0.08	1.007	(0.825, 1.229)	0.94
Others	1.360	(1.135, 1.629)	<0.001	0.908	(0.742, 1.112)	0.35
No Radiation	0.913	(0.811, 1.028)	0.13	1.580	(1.385, 1.804)	<0.0001
No Surgery	0.884	(0.787, 0.993)	0.04	2.146	(1.885, 2.443)	<0.0001
Dead	0.997	(0.888, 1.120)	0.96	2.205	(1.937, 2.510)	<0.0001
H0(t)d	1.416	(1.235, 1.624)	<0.0001	0.641	(0.549, 0.747)	<0.0001

^aOdds ratio (HER2+ vs. HER−).

^b95% Confidence interval.

^cp-Value.

^dBaseline cumulative hazard.