condition mean min max ZT0-3 40.98117500000001 36.0525 45.909850000000006 ZT4-7 61.945550000000004 61.945550000000004 61.945550000000004 ZT8-11 17.73225 17.73225 17.73225 ZT12-15 0 0 0 ZT16-19 5.399905 5.399905 5.399905 ZT20-23 20.79485 20.79485 20.79485