condition mean min max ZT0-3 823.5 823.5 823.5 ZT4-7 986.8 986.8 986.8 ZT8-11 885.75 885.75 885.75 ZT12-15 941.0999999999999 941.0999999999999 941.0999999999999 ZT16-19 842.2 842.2 842.2 ZT20-23 813.25 813.25 813.25