condition mean min max ZT0-3 10.524632 10.524632 10.524632 ZT4-7 10.08103 10.08103 10.08103 ZT8-11 8.64385 8.64385 8.64385 ZT12-15 8.6942015 8.6942015 8.6942015 ZT16-19 9.9644715 9.9644715 9.9644715 ZT20-23 9.7227975 9.7227975 9.7227975