condition mean min max ZT0-3 23.896349999999998 23.896349999999998 23.896349999999998 ZT4-7 24.02675 24.02675 24.02675 ZT8-11 17.33215 17.33215 17.33215 ZT12-15 21.356949999999998 21.356949999999998 21.356949999999998 ZT16-19 18.9137 18.9137 18.9137 ZT20-23 23.0922 23.0922 23.0922