condition mean min max ZT0-3 3.6878306666666663 1.213782 5.707929999999999 ZT4-7 1.36789 1.36789 1.36789 ZT8-11 0.489985 0.489985 0.489985 ZT12-15 0.8111165 0.6041285000000001 1.0181045 ZT16-19 2.9994 2.9994 2.9994 ZT20-23 5.2318999999999996 5.2318999999999996 5.2318999999999996