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Table 3 Results of the chi-square tests of the martingale residual processes for the continuous covariate age entered in two extended Aalen’s models

From: A strategy for optimal fitting of multiplicative and additive hazards regression models

Age P-value
  exp (age/10) exp (age/10) + exp (age/10–7)(age > 70)
≤59.6 0.007 0.179
(59.6–68.2] 0.310 0.381
(68.2–75.4] 0.459 0.404
>75.4 0.416 0.197
global 0.056 0.221