condition mean min max ZT0-3 26.87063 26.87063 26.87063 ZT4-7 32.984314 32.984314 32.984314 ZT8-11 38.657965000000004 38.657965000000004 38.657965000000004 ZT12-15 37.094023 37.094023 37.094023 ZT16-19 40.033325000000005 40.033325000000005 40.033325000000005 ZT20-23 32.6285855 32.6285855 32.6285855