condition mean min max ZT0-3 8.879203333333335 6.156090000000001 10.245875 ZT4-7 5.436115 5.436115 5.436115 ZT8-11 6.52919 6.52919 6.52919 ZT12-15 9.560872499999999 8.56199 10.559755 ZT16-19 10.75675 10.75675 10.75675 ZT20-23 11.923549999999999 11.923549999999999 11.923549999999999