Fig. 2.

The risk of bias (ROB) analysis of 54 selected studies, which served as the data source for the meta-analysis on the influence of temperature and duration of storage on the quantity of vitamin C in citrus fruits. Individual ROB (A) and Summary of ROB Across Studies (B).

$$Y_{ij}=\mu +s_i+{\tau }_j+{s\tau }_{ij}+{\beta }_0+{\beta }_1{L}_{ij}+b_i{L}_{ij}+{\beta }_2{L_{ij}}^2+{b_i{L}_{ij}}^2+e_{ij}$$ (1)