condition mean min max ZT0-3 29.667225000000002 28.53085 30.8036 ZT4-7 33.65665 33.65665 33.65665 ZT8-11 63.865449999999996 63.865449999999996 63.865449999999996 ZT12-15 0 0 0 ZT16-19 57.357600000000005 57.357600000000005 57.357600000000005 ZT20-23 34.1712 34.1712 34.1712