condition mean min max ZT0-3 1.7160575 1.672475 1.75964 ZT4-7 3.445645 3.445645 3.445645 ZT8-11 4.861689999999999 4.861689999999999 4.861689999999999 ZT12-15 0 0 0 ZT16-19 3.9882850000000003 3.9882850000000003 3.9882850000000003 ZT20-23 3.91874 3.91874 3.91874