condition mean min max ZT0-3 11.665942 11.665942 11.665942 ZT4-7 11.741734000000001 11.741734000000001 11.741734000000001 ZT8-11 12.0495885 12.0495885 12.0495885 ZT12-15 10.0748255 10.0748255 10.0748255 ZT16-19 11.1609665 11.1609665 11.1609665 ZT20-23 10.831869 10.831869 10.831869