condition mean min max ZT0-3 6720.616672 6720.616672 6720.616672 ZT4-7 6203.326211 6203.326211 6203.326211 ZT8-11 4412.182838000001 4412.182838000001 4412.182838000001 ZT12-15 5540.9142305000005 5540.9142305000005 5540.9142305000005 ZT16-19 3996.079828 3996.079828 3996.079828 ZT20-23 3186.4736464999996 3186.4736464999996 3186.4736464999996