condition mean min max ZT0-3 1.223925 0.625495 1.81319 ZT4-7 0.3980035 0.3980035 0.3980035 ZT8-11 0.503745 0.503745 0.503745 ZT12-15 0.7375400000000001 0.0 1.4750800000000002 ZT16-19 0.390721 0.390721 0.390721 ZT20-23 1.62154 1.62154 1.62154