condition mean min max ZT0-3 12.717818 12.717818 12.717818 ZT4-7 12.804109 12.804109 12.804109 ZT8-11 12.959800999999999 12.959800999999999 12.959800999999999 ZT12-15 11.965656 11.965656 11.965656 ZT16-19 12.7082125 12.7082125 12.7082125 ZT20-23 11.431345 11.431345 11.431345