condition mean min max ZT0-3 25.896595 25.896595 25.896595 ZT4-7 23.804045000000002 23.804045000000002 23.804045000000002 ZT8-11 22.231006999999998 22.231006999999998 22.231006999999998 ZT12-15 26.1492285 26.1492285 26.1492285 ZT16-19 26.574766 26.574766 26.574766 ZT20-23 27.4884515 27.4884515 27.4884515