condition mean min max ZT0-3 15.786525000000001 15.74125 15.8318 ZT4-7 30.0158 30.0158 30.0158 ZT8-11 28.9914 28.9914 28.9914 ZT12-15 0 0 0 ZT16-19 29.32645 29.32645 29.32645 ZT20-23 19.2807 19.2807 19.2807