condition mean min max ZT0-3 1.706828 1.3994810000000002 2.014175 ZT4-7 2.078995 2.078995 2.078995 ZT8-11 3.112235 3.112235 3.112235 ZT12-15 0 0 0 ZT16-19 3.036495 3.036495 3.036495 ZT20-23 2.72147 2.72147 2.72147