condition mean min max ZT0-3 0.3748535 0.0 0.749707 ZT4-7 1.0024195 1.0024195 1.0024195 ZT8-11 1.026365 1.026365 1.026365 ZT12-15 0 0 0 ZT16-19 0.743669 0.743669 0.743669 ZT20-23 0.2503485 0.2503485 0.2503485