condition mean min max ZT0-3 2.74503 1.7946550000000001 3.695405 ZT4-7 7.6630899999999995 7.6630899999999995 7.6630899999999995 ZT8-11 3.571625 3.571625 3.571625 ZT12-15 0 0 0 ZT16-19 8.323555 8.323555 8.323555 ZT20-23 13.930299999999999 13.930299999999999 13.930299999999999