condition mean min max ZT0-3 0.5488035 0.43572999999999995 0.661877 ZT4-7 1.0003955 1.0003955 1.0003955 ZT8-11 1.3218735 1.3218735 1.3218735 ZT12-15 0 0 0 ZT16-19 0.21704600000000002 0.21704600000000002 0.21704600000000002 ZT20-23 0.435364 0.435364 0.435364