condition mean min max ZT0-3 2.5881100000000004 2.30897 2.8672500000000003 ZT4-7 5.414994999999999 5.414994999999999 5.414994999999999 ZT8-11 3.2195549999999997 3.2195549999999997 3.2195549999999997 ZT12-15 0 0 0 ZT16-19 3.9473149999999997 3.9473149999999997 3.9473149999999997 ZT20-23 5.240745 5.240745 5.240745