condition mean min max ZT0-3 1.008455 0.0 1.8144500000000001 ZT4-7 2.39701 2.39701 2.39701 ZT8-11 2.43169 2.43169 2.43169 ZT12-15 5.692905 4.38901 6.9968 ZT16-19 8.04309 8.04309 8.04309 ZT20-23 3.9092200000000004 3.9092200000000004 3.9092200000000004