condition mean min max ZT0-3 24.891397 24.891397 24.891397 ZT4-7 20.859762500000002 20.859762500000002 20.859762500000002 ZT8-11 24.296758 24.296758 24.296758 ZT12-15 27.999094 27.999094 27.999094 ZT16-19 21.795108 21.795108 21.795108 ZT20-23 19.663997000000002 19.663997000000002 19.663997000000002