condition mean min max ZT0-3 5.573855 5.573855 5.573855 ZT4-7 4.62311 4.62311 4.62311 ZT8-11 4.410349999999999 4.410349999999999 4.410349999999999 ZT12-15 6.6334 6.6334 6.6334 ZT16-19 4.670065 4.670065 4.670065 ZT20-23 7.54056 7.54056 7.54056