condition mean min max ZT0-3 25.688475 25.688475 25.688475 ZT4-7 28.9504935 28.9504935 28.9504935 ZT8-11 27.158613000000003 27.158613000000003 27.158613000000003 ZT12-15 24.9933035 24.9933035 24.9933035 ZT16-19 28.931556999999998 28.931556999999998 28.931556999999998 ZT20-23 23.905939 23.905939 23.905939