condition mean min max ZT0-3 0.06330725 0.026476350000000003 0.11972545 ZT4-7 0.058824150000000006 0.058824150000000006 0.058824150000000006 ZT8-11 0.05240585 0.05240585 0.05240585 ZT12-15 0.01395805 0.0096847 0.018231400000000002 ZT16-19 0.01661745 0.01661745 0.01661745 ZT20-23 0.00954285 0.00954285 0.00954285