Journal of Population Sciences
Table 2 Testing the constant senescence hypothesis
| Â | Sardinia - males | Sardinia - females | Italy - males | Italy - females | ||||
|---|---|---|---|---|---|---|---|---|
Estimate | SE | Estimate | SE | Estimate | SE | Estimate | SE | |
Equation 5 | ||||||||
 Rate of aging | ||||||||
  All cohorts | 0.19 | 0.016 | 0.18 | 0.013 | 0.097 | 0.006 | 0.11 | 0.081 |
 σ2 (mean value) | [0.98] | – | [0.81] | – | [0.10] | – | [0.14] | – |
 R2 | 0.11 | – | 0.12 | – | 0.02 | – | 0.05 | – |
Equation 6 | ||||||||
 Rate of aging | ||||||||
  Cohorts 1860–1869 | 0.35 | 0.107 | 0.25 | 0.072 | – | – | – | – |
  Cohorts 1870–1879 | 0.22 | 0.037 | 0.20 | 0.035 | 0.13 | 0.014 | 0.12 | 0.014 |
  Cohorts 1880–1889 | 0.21 | 0.034 | 0.20 | 0.028 | 0.11 | 0.011 | 0.12 | 0.010 |
  Cohorts 1890–1899 | 0.22 | 0.029 | 0.23 | 0.023 | 0.10 | 0.012 | 0.11 | 0.009 |
  Cohorts 1900–1908 | 0.10 | 0.031 | 0.09 | 0.023 | 0.08 | 0.01 | 0.10 | 0.007 |
 σ2 (mean value) | [1.07] | – | [0.91] | – | [0.12] | – | [0.15] | – |
 R2 | 0.12 | – | 0.15 | – | 0.04 | – | 0.06 | – |
ANOVA | F stat. | Pr(> F) | F stat. | Pr(> F) | F stat. | Pr(> F) | F stat. | Pr(> F) |
2.92 | 0.02 | 5.82 | < 0.001 | 3.53 | 0.01 | 0.71 | 0.55 | |