condition mean min max ZT0-3 6.1346799999999995 6.1346799999999995 6.1346799999999995 ZT4-7 3.326635 3.326635 3.326635 ZT8-11 2.839905 2.839905 2.839905 ZT12-15 2.4345299999999996 2.4345299999999996 2.4345299999999996 ZT16-19 3.180155 3.180155 3.180155 ZT20-23 7.460675 7.460675 7.460675