condition mean min max ZT0-3 10.0 10.0 10.0 ZT4-7 3.2 3.2 3.2 ZT8-11 15.45 15.45 15.45 ZT12-15 13.95 13.95 13.95 ZT16-19 24.650000000000002 24.650000000000002 24.650000000000002 ZT20-23 23.8 23.8 23.8