condition mean min max ZT0-3 9.55 9.55 9.55 ZT4-7 11.2 11.2 11.2 ZT8-11 33.300000000000004 33.300000000000004 33.300000000000004 ZT12-15 26.75 26.75 26.75 ZT16-19 9.0 9.0 9.0 ZT20-23 11.100000000000001 11.100000000000001 11.100000000000001