condition mean min max ZT0-3 12.31965 12.31965 12.31965 ZT4-7 11.886865 11.886865 11.886865 ZT8-11 10.151869999999999 10.151869999999999 10.151869999999999 ZT12-15 11.6576 11.6576 11.6576 ZT16-19 13.341650000000001 13.341650000000001 13.341650000000001 ZT20-23 11.90565 11.90565 11.90565