condition mean min max ZT0-3 17.203577 17.203577 17.203577 ZT4-7 19.217895499999997 19.217895499999997 19.217895499999997 ZT8-11 36.848725 36.848725 36.848725 ZT12-15 43.336192000000004 43.336192000000004 43.336192000000004 ZT16-19 32.1576765 32.1576765 32.1576765 ZT20-23 33.9642135 33.9642135 33.9642135