condition mean min max ZT0-3 5.1000000000000005 5.1000000000000005 5.1000000000000005 ZT4-7 13.2 13.2 13.2 ZT8-11 5.9 5.9 5.9 ZT12-15 4.45 4.45 4.45 ZT16-19 12.0 12.0 12.0 ZT20-23 14.25 14.25 14.25