condition mean min max ZT0-3 12.0779525 10.069005 14.0869 ZT4-7 11.558150000000001 11.558150000000001 11.558150000000001 ZT8-11 6.40475 6.40475 6.40475 ZT12-15 0 0 0 ZT16-19 6.2548449999999995 6.2548449999999995 6.2548449999999995 ZT20-23 8.417435000000001 8.417435000000001 8.417435000000001