condition mean min max ZT0-3 1.7210235 1.6603370000000002 1.78171 ZT4-7 2.11727 2.11727 2.11727 ZT8-11 1.97919 1.97919 1.97919 ZT12-15 0 0 0 ZT16-19 2.377745 2.377745 2.377745 ZT20-23 8.802810000000001 8.802810000000001 8.802810000000001