condition mean min max ZT0-3 1.5210695 1.3839890000000001 1.65815 ZT4-7 6.35458 6.35458 6.35458 ZT8-11 10.592965 10.592965 10.592965 ZT12-15 0 0 0 ZT16-19 4.1918050000000004 4.1918050000000004 4.1918050000000004 ZT20-23 3.96148 3.96148 3.96148