Comparison of intron lengths

d: the name of each group ;e: all sample genes;f: the number of genes in each group;g: the average lengths (unit: bp) of the first introns;h: the average lengths of the non-first introns;i: the gene proportions observed with the first intron length shorter than their expected length;j: the gene proportions observed with the first intron length equal to their expected length;k: the gene proportions observed with the first intron length longer than their expected length;l: the value of KS test.