condition mean min max ZT0-3 33.2109747175 32.095728805 34.32622063 ZT4-7 12.017551312750001 10.5385480825 13.496554543 ZT8-11 14.44451120425 10.220087918499999 18.66893449 ZT12-15 16.6174408275 14.858087345000001 18.37679431 ZT16-19 17.01931605 14.58193124 19.45670086 ZT20-23 27.6954517075 25.39612254 29.994780875