condition mean min max ZT0-3 3.8708574999999996 3.14554 4.596175 ZT4-7 1.611195 1.611195 1.611195 ZT8-11 1.439235 1.439235 1.439235 ZT12-15 0 0 0 ZT16-19 5.212775 5.212775 5.212775 ZT20-23 7.9073150000000005 7.9073150000000005 7.9073150000000005