condition mean min max ZT0-3 28.059916666666666 14.433900000000001 37.08775 ZT4-7 12.7541 12.7541 12.7541 ZT8-11 14.29005 14.29005 14.29005 ZT12-15 26.699575 23.4696 29.92955 ZT16-19 32.69665 32.69665 32.69665 ZT20-23 45.3946 45.3946 45.3946