condition mean min max ZT0-3 0.5793571666666667 0.5351205 0.6360075 ZT4-7 0.2445545 0.2445545 0.2445545 ZT8-11 0.131457 0.131457 0.131457 ZT12-15 0.66632675 0.46025099999999997 0.8724025 ZT16-19 0.336503 0.336503 0.336503 ZT20-23 0.9376615 0.9376615 0.9376615