condition mean min max ZT0-3 3.5630625 3.3578 3.768325 ZT4-7 3.943085 3.943085 3.943085 ZT8-11 11.657305000000001 11.657305000000001 11.657305000000001 ZT12-15 0 0 0 ZT16-19 12.4932 12.4932 12.4932 ZT20-23 8.840655 8.840655 8.840655