condition mean min max ZT0-3 1058.428164 1058.428164 1058.428164 ZT4-7 1367.13664 1367.13664 1367.13664 ZT8-11 1823.6359029999999 1823.6359029999999 1823.6359029999999 ZT12-15 1555.9375725 1555.9375725 1555.9375725 ZT16-19 1342.5746804999999 1342.5746804999999 1342.5746804999999 ZT20-23 1629.972674 1629.972674 1629.972674