condition mean min max ZT0-3 7.1726849999999995 7.1726849999999995 7.1726849999999995 ZT4-7 4.7484 4.7484 4.7484 ZT8-11 4.06847 4.06847 4.06847 ZT12-15 4.738855 4.738855 4.738855 ZT16-19 6.29628 6.29628 6.29628 ZT20-23 7.9309650000000005 7.9309650000000005 7.9309650000000005