The modelling was conducted using the AsReml package (Butler et al., 2009) in the R programming environment (R Core Development Team, 2012). Ethylene rate was log10 transformed to help linearise the response of green life and since green life was observed to be more uniform at the high (1.00 μL/L) ethylene concentration, the linear mixed model specification included an extra variance component for the other 3 concentrations. This model was shown to be an improvement over the homogeneous variance model according to its reduced Akaike Information Criterion. Ethylene concentrations were calculated from the fixed model parameters for given values of green life and storage temperature. Standard errors, calculated with the delta method on the log10 scale, were then used to interpolate 95% confidence limits on the back transformed scale (μL/L) using the R package car (Fox and Weisberg, 2011).