condition mean min max ZT0-3 3.44343 3.37181 3.51505 ZT4-7 3.05368 3.05368 3.05368 ZT8-11 2.613785 2.613785 2.613785 ZT12-15 0 0 0 ZT16-19 3.5042400000000002 3.5042400000000002 3.5042400000000002 ZT20-23 3.219535 3.219535 3.219535