condition mean min max ZT0-3 21.688883333333333 13.49005 27.63335 ZT4-7 11.29565 11.29565 11.29565 ZT8-11 10.12377 10.12377 10.12377 ZT12-15 12.94165 10.694700000000001 15.1886 ZT16-19 14.53135 14.53135 14.53135 ZT20-23 23.57575 23.57575 23.57575