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Table 1 Parameter estimates (standard errors in brackets) of the best fitting two-component Gaussian mixture model for the regression of age-at-diagnosis of female breast cancer among US women diagnosed from 1990 to 2009 based on 40 imputations of a sample of size n = 20,000

From: Temporal trend, clinicopathologic and sociodemographic characterization of age at diagnosis of breast cancer among US women diagnosed from 1990 to 2009

Covariate       β1       β2       γ1       γ2       δ
Intercept 50.29 (1.111) 71.91 (2.027) 4.039 (0.160) 4.172 (0.237) −0.793 (0.337)
trend 347.3 (37.97) 363.1 (50.02) 25.92 (4.748) −20.28 (6.118) −73.57 (8.561)
SITE2 −1.901 (0.732) −4.311 (1.149) −0.387 (0.125) 0.359 (0.119) 0.713 (0.234)
SITE 3 0.594 (0.820) 0.904 (0.812) 0.099 (0.100) 0.181 (0.100) 0.292 (0.156)
GRADE 2 −0.007 (0.692) 0.351 (0.725) 0.211 (0.096) −0.033 (0.094) −0.257 (0.143)
GRADE 3 −1.368 (0.744) −0.172 (0.870) 0.287 (0.105) 0.009 (0.110) −0.698 (0.160)
EXTENSION 2 0.863 (0.890) 2.686 (1.693) 0.245 (0.121) 0.040 (0.199) 0.314 (0.293)
EXTENSION 3 4.089 (1.189) 6.573 (1.781) 0.355 (0.159) −0.147 (0.211) 0.455 (0.311)
LYMPH 2 −2.380 (0.571) −2.658 (0.704) −0.100 (0.073) 0.113 (0.090) −0.165 (0.122)
SIZE 2 −0.540 (0.560) 2.060 (0.693) 0.125 (0.070) 0.088 (0.085) −0.088 (0.120)
RACE 2 −0.562 (0.738) −1.174 (1.221) 0.057 (0.093) −0.007 (0.147) −0.433 (0.194)
RACE 3 −0.708 (0.863) −1.428 (1.151) 0.109 (0.108) −0.133 (0.149) −0.462 (0.211)
MARRIED 2 1.961 (0.567) −0.696 (0.979) −0.185 (0.075) 0.005 (0.125) 0.845 (0.143)
  1. p - value < 0.05, p - value < 0.01, p - value < 0.001.