condition mean min max ZT0-3 14.577886 14.577886 14.577886 ZT4-7 13.943705999999999 13.943705999999999 13.943705999999999 ZT8-11 14.51031 14.51031 14.51031 ZT12-15 16.071556 16.071556 16.071556 ZT16-19 15.4049165 15.4049165 15.4049165 ZT20-23 13.585562 13.585562 13.585562