the quantile values of all variables other than sp are means of the variable values that are associated with those sp values that fall within a 5% confidence interval around any given quantile point of sp (as noted in the body of the table). In other words, the values of the explanatory variables are approximately tied to the values of the dependent variable for each quantile point; although not point for point to avoid unrepresentative values of the explanatory variables being associated with a particular quantile point of the dependent variable.
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