Left-truncated Cox proportional hazards modelling with age as the time scale was used to assess risk factors for earlier mortality.
a. males, YSM=20, model with age at arrival dummies, b. males, YSM=20, model with age at arrival polynomial, c. females, YSM=20, model with age at arrival dummies, d. females, YSM=20, model with age at arrival polynomial.
A nonautonomous SIR epidemic model with age structure is studied.
This type of equations describe interesting phenomena such as transport models [46] or population models with age distribution [47].
This paper is organized as follows: Section 2 introduces a non-autonomous SIR model with age structure.
Then such diseases are described more precisely by means of the so-called compartmental models with age structure [15].
In this paper, existence of positive period solution of a non-autonomous SIR epidemic model with age structure is studied.
The number of independent variables in each model ranged from two to five for the models without age and three to five for the models with age.
Combining age with Site Index reduced the RMSE to 1.46 m while a model with age and mean REVI had an RMSE of 1.52 m (Table 3).
However gains obtained through adding REVI and Site Index to the base model with age did not result in model improvement at the Tairua site.
