condition mean min max ZT0-3 7.55822 6.99805 8.003405 ZT4-7 7.457649999999999 7.457649999999999 7.457649999999999 ZT8-11 4.895 4.895 4.895 ZT12-15 8.7260725 8.101115 9.35103 ZT16-19 7.8839950000000005 7.8839950000000005 7.8839950000000005 ZT20-23 9.00768 9.00768 9.00768