condition mean min max ZT0-3 400.565124 400.565124 400.565124 ZT4-7 252.860672 252.860672 252.860672 ZT8-11 216.65488249999999 216.65488249999999 216.65488249999999 ZT12-15 271.7013805 271.7013805 271.7013805 ZT16-19 370.00216 370.00216 370.00216 ZT20-23 406.456055 406.456055 406.456055