condition mean min max ZT0-3 17.681725 17.681725 17.681725 ZT4-7 12.145960500000001 12.145960500000001 12.145960500000001 ZT8-11 10.9754895 10.9754895 10.9754895 ZT12-15 12.969566499999999 12.969566499999999 12.969566499999999 ZT16-19 10.9447435 10.9447435 10.9447435 ZT20-23 9.715107 9.715107 9.715107