condition mean min max ZT0-3 15.734183495 14.980272880000001 16.48809411 ZT4-7 13.889845704999999 13.32984342 14.44984799 ZT8-11 17.44553500166667 15.78421497 19.106855033333336 ZT12-15 13.59832006 12.235287653333334 14.961352466666668 ZT16-19 14.549273288333334 14.356351646666667 14.74219493 ZT20-23 14.355539515 13.501452460000001 15.209626570000001