condition mean min max ZT0-3 7.3882403729999995 6.368478023 8.408002723 ZT4-7 6.200877762999999 5.507109491 6.894646035 ZT8-11 8.2364057125 7.5635414955 8.909269929499999 ZT12-15 7.39296692825 7.2320663705 7.553867486 ZT16-19 6.36709596725 5.523316225 7.2108757095 ZT20-23 9.722550679000001 8.568536843 10.876564515