condition mean min max ZT0-3 0.9935596666666666 0.4300965 1.52261 ZT4-7 1.5200049999999998 1.5200049999999998 1.5200049999999998 ZT8-11 1.292685 1.292685 1.292685 ZT12-15 1.12176725 1.0223630000000001 1.2211715 ZT16-19 0.6015915000000001 0.6015915000000001 0.6015915000000001 ZT20-23 1.154285 1.154285 1.154285