condition mean min max ZT0-3 13.2 13.2 13.2 ZT4-7 9.0 9.0 9.0 ZT8-11 68.05000000000001 68.05000000000001 68.05000000000001 ZT12-15 10.5 10.5 10.5 ZT16-19 9.95 9.95 9.95 ZT20-23 10.45 10.45 10.45