condition mean min max ZT0-3 2.8983566666666665 2.393185 3.672075 ZT4-7 0.362657 0.362657 0.362657 ZT8-11 1.22582 1.22582 1.22582 ZT12-15 0.7772745000000001 0.434109 1.12044 ZT16-19 0.2680545 0.2680545 0.2680545 ZT20-23 1.32563 1.32563 1.32563