Table 4.

Average cross-validated estimates using T and Z information using the proposed procedure ( ${\text{BS}}_{t_0,\tau }^{(2)},{\text{AUC}}_{t_0,\tau }^{(2)}$) compared to using the landmark Cox model ( ${\text{BS}}_{t_0,\tau }^{(2)(\text{cox})},{\text{AUC}}_{t_0,\tau }^{(2)(\text{cox})}$) (with corresponding SE estimates). All entries are multiplied by 100.

(a) Brier score
	${\text{BS}}_{t_0,\tau }^{(2)}$	${\text{BS}}_{t_0,\tau }^{(2)(\text{cox})}$	IPEV2/cox
(i) low event rate
n=2000	79.2 (0.42)	83.9 (0.45)	5.3 (7.6)
n=5000	78.2 (0.27)	83.6 (0.29)	63.4 (4.8)
(ii) moderate event rate
n=2000	10.2 (0.44)	13.5 (0.50)	24.6 (4.5)
n=5000	10.0 (0.28)	13.5 (0.32)	25.9 (2.7)
(b) AUC
	${\text{AUC}}_{t_0,\tau }^{(2)}$	${\text{AUC}}_{t_0,\tau }^{(2)(\text{cox})}$	${\text{AUC}}_{t_0,\tau }^{(2)}{-\text{AUC}}_{t_0,\tau }^{(2)(\text{cox})}$
(i) low event rate
n=2000	89.3 (0.93)	87.9 (1.01)	1.4 (1.54)
n=5000	89.6 (0.58)	87.9 (0.65)	1.7 (0.93)
(ii) moderate event rate
n=2000	91.2 (0.69)	85.8 (0.95)	5.4 (1.22)
n=5000	91.5 (0.44)	85.8 (0.64)	5.7 (0.79)