condition mean min max ZT0-3 42.8762 42.8762 42.8762 ZT4-7 43.4028 43.4028 43.4028 ZT8-11 31.844 31.844 31.844 ZT12-15 22.52145 22.52145 22.52145 ZT16-19 31.887349999999998 31.887349999999998 31.887349999999998 ZT20-23 35.50195 35.50195 35.50195