condition mean min max ZT0-3 14.603108 14.603108 14.603108 ZT4-7 14.972604 14.972604 14.972604 ZT8-11 13.978144 13.978144 13.978144 ZT12-15 12.2257955 12.2257955 12.2257955 ZT16-19 10.700343499999999 10.700343499999999 10.700343499999999 ZT20-23 9.6647715 9.6647715 9.6647715