condition mean min max ZT0-3 35.77265 21.19725 46.218450000000004 ZT4-7 16.17745 16.17745 16.17745 ZT8-11 18.322850000000003 18.322850000000003 18.322850000000003 ZT12-15 32.481125 25.387 39.57525 ZT16-19 33.85715 33.85715 33.85715 ZT20-23 39.44535 39.44535 39.44535