condition mean min max ZT0-3 2.50107 2.430135 2.572005 ZT4-7 3.19972 3.19972 3.19972 ZT8-11 5.3007100000000005 5.3007100000000005 5.3007100000000005 ZT12-15 0 0 0 ZT16-19 4.5611049999999995 4.5611049999999995 4.5611049999999995 ZT20-23 3.639875 3.639875 3.639875