condition mean min max ZT0-3 1.5602596666666666 1.5602596666666666 1.5602596666666666 ZT4-7 0.647732 0.647732 0.647732 ZT8-11 0.8060635 0.8060635 0.8060635 ZT12-15 1.1373769999999999 1.1373769999999999 1.1373769999999999 ZT16-19 1.01199333397 1.01199333397 1.01199333397 ZT20-23 0.373106 0.373106 0.373106