condition mean min max ZT0-3 29.078699999999998 27.6284 30.529 ZT4-7 23.08645 23.08645 23.08645 ZT8-11 16.1147 16.1147 16.1147 ZT12-15 0 0 0 ZT16-19 23.2939 23.2939 23.2939 ZT20-23 22.6572 22.6572 22.6572