condition mean min max ZT0-3 7.703055 7.703055 7.703055 ZT4-7 5.564375 5.564375 5.564375 ZT8-11 5.799049999999999 5.799049999999999 5.799049999999999 ZT12-15 7.287825 7.287825 7.287825 ZT16-19 12.05845 12.05845 12.05845 ZT20-23 9.083189999999998 9.083189999999998 9.083189999999998