Table 6 Parameter estimates for Scots pine and Norway spruce hypothesis equations (Eq. 10, Table 2). Standard errors of parameter (in parentheses) of fixed parameters and standard deviation of random parameters were given. Parameter values with grey background are statistically significant based on REML approach. β_A was calculated separately for each group. Old group is the reference with the representative values of β₁

From: Age effect on tree structure and biomass allocation in Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies [L.] Karst.)