condition mean min max ZT0-3 7.1961025 7.044185000000001 7.34802 ZT4-7 3.13667 3.13667 3.13667 ZT8-11 2.7849250000000003 2.7849250000000003 2.7849250000000003 ZT12-15 0 0 0 ZT16-19 11.999649999999999 11.999649999999999 11.999649999999999 ZT20-23 10.5182 10.5182 10.5182