condition mean min max ZT0-3 16.420700000000004 15.17435 17.667050000000003 ZT4-7 9.657395000000001 9.657395000000001 9.657395000000001 ZT8-11 10.81305 10.81305 10.81305 ZT12-15 0 0 0 ZT16-19 13.4333 13.4333 13.4333 ZT20-23 13.60815 13.60815 13.60815