condition mean min max ZT0-3 13.799856 13.799856 13.799856 ZT4-7 14.5812745 14.5812745 14.5812745 ZT8-11 13.272774 13.272774 13.272774 ZT12-15 12.093187499999999 12.093187499999999 12.093187499999999 ZT16-19 12.431913 12.431913 12.431913 ZT20-23 13.1265635 13.1265635 13.1265635