condition mean min max ZT0-3 16.169150000000002 15.1928 17.145500000000002 ZT4-7 18.56285 18.56285 18.56285 ZT8-11 11.718295000000001 11.718295000000001 11.718295000000001 ZT12-15 0 0 0 ZT16-19 25.7473 25.7473 25.7473 ZT20-23 19.5381 19.5381 19.5381