Table 1.

Actuarial (Life-Table) Analysis

Interval	Number of Patients at the Beginning of the Interval	Number of Patients Who Died During the Interval	Number of Patients Lost to Follow-up During the Interval	Number of Patients Withdrawn Alive During the Interval	Number of Patients Exposed to Risk of Death	Conditional Probability of Death	Conditional Probability of Survival	Survival Rate
X	Nx	Dx	Lx	Wx	Ex=(Wx+Lx)/2	Qx=Dx/Ex	px=1-Dx/Ex	Px=p1×p2×···px
1	N1	D1	L1	W1	E1	Q1	p1	P1
2	N2	D2	L2	W2	E2	Q2	p2	P2