condition mean min max ZT0-3 42.75 42.75 42.75 ZT4-7 25.6 25.6 25.6 ZT8-11 45.35 45.35 45.35 ZT12-15 68.6 68.6 68.6 ZT16-19 53.650000000000006 53.650000000000006 53.650000000000006 ZT20-23 23.9 23.9 23.9