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Table 1 Parameter estimates of two-parameter Weibull failure model fitted to the survival characteristics of Lymnaea stagnalis populations used in the present study

From: Failure of delayed nonsynaptic neuronal plasticity underlies age-associated long-term associative memory impairment

Population

a(error)

c(error)

s· 10-2(error)

% survival at sampling

age range (month)

Junior 1

490 (9.9)

3.7 (0.25)

−0.26 (1.37 · 10-2)

>95%

5-7

Senior 1

440 (8.3)

4.3 (0.29)

−0.34 (1.19 · 10-2)

<25%

18-20

Senior 2

550 (9.6)

4.0 (0.29)

−0.25 (1.56 · 10-2)

<25%

21-22

Senior 3

550 (7.4)

4.5 (0.29)

−0.28 (1.91 · 10-2)

<25%

21-22

Senior 4

570 (9.6)

3.8 (0.28)

−0.23 (1.66 · 10-2)

<25%

22-23

  1. Note: “a” and “c” are parameters of the two-parameter Weibull model (“a” is median age; “c” is the shape parameter; “s” is slope of tangent of survival curve at median age).