condition mean min max ZT0-3 22.785771037499998 16.43960684 29.131935235 ZT4-7 34.163635635 33.21160405 35.11566722 ZT8-11 40.3318625625 35.048428635 45.61529649 ZT12-15 41.4627527775 38.868250225 44.057255330000004 ZT16-19 47.355737475 46.126338945 48.585136004999995 ZT20-23 42.0142298625 40.31891874 43.709540985000004