condition mean min max ZT0-3 19.479601055 19.34407006 19.61513205 ZT4-7 17.317997085000002 16.582612795 18.053381375 ZT8-11 8.7898767755 6.887205414 10.692548137 ZT12-15 4.00193534775 3.176409282 4.8274614135 ZT16-19 6.728278900499999 6.277372403499999 7.1791853974999995 ZT20-23 8.14930515475 7.6920153875 8.606594922