condition mean min max ZT0-3 21.556150000000002 21.556150000000002 21.556150000000002 ZT4-7 23.0275 23.0275 23.0275 ZT8-11 15.97995 15.97995 15.97995 ZT12-15 14.66235 14.66235 14.66235 ZT16-19 15.052299999999999 15.052299999999999 15.052299999999999 ZT20-23 17.48085 17.48085 17.48085