condition mean min max ZT0-3 52.650000000000006 52.650000000000006 52.650000000000006 ZT4-7 21.9 21.9 21.9 ZT8-11 85.85 85.85 85.85 ZT12-15 73.45 73.45 73.45 ZT16-19 93.2 93.2 93.2 ZT20-23 133.35 133.35 133.35