condition mean min max ZT0-3 3.8956175 3.230915 4.560320000000001 ZT4-7 5.2776499999999995 5.2776499999999995 5.2776499999999995 ZT8-11 3.755425 3.755425 3.755425 ZT12-15 0 0 0 ZT16-19 5.89274 5.89274 5.89274 ZT20-23 6.77238 6.77238 6.77238