condition mean min max ZT0-3 13.5918 13.260449999999999 13.92315 ZT4-7 12.1081 12.1081 12.1081 ZT8-11 55.2386 55.2386 55.2386 ZT12-15 0 0 0 ZT16-19 43.230999999999995 43.230999999999995 43.230999999999995 ZT20-23 26.50055 26.50055 26.50055