condition mean min max ZT0-3 9.89462 9.75093 10.03831 ZT4-7 6.91638 6.91638 6.91638 ZT8-11 4.24608 4.24608 4.24608 ZT12-15 0 0 0 ZT16-19 10.487675 10.487675 10.487675 ZT20-23 9.921434999999999 9.921434999999999 9.921434999999999