condition mean min max ZT0-3 0.349364 0.349364 0.349364 ZT4-7 1.639145 1.639145 1.639145 ZT8-11 6.733185000000001 6.733185000000001 6.733185000000001 ZT12-15 4.32223 4.32223 4.32223 ZT16-19 1.732055 1.732055 1.732055 ZT20-23 0.40225750000000005 0.40225750000000005 0.40225750000000005