condition mean min max ZT0-3 25.710633333333334 23.1873 27.5193 ZT4-7 25.7833 25.7833 25.7833 ZT8-11 24.05235 24.05235 24.05235 ZT12-15 31.453475 31.33365 31.573300000000003 ZT16-19 28.106949999999998 28.106949999999998 28.106949999999998 ZT20-23 28.3893 28.3893 28.3893