condition mean min max ZT0-3 1.041214 1.041214 1.041214 ZT4-7 0.939341 0.939341 0.939341 ZT8-11 0.5229085 0.5229085 0.5229085 ZT12-15 0.5352574999999999 0.5352574999999999 0.5352574999999999 ZT16-19 0.593009 0.593009 0.593009 ZT20-23 1.0367380000000002 1.0367380000000002 1.0367380000000002