condition mean min max ZT0-3 0.535296 0.535296 0.535296 ZT4-7 0.2440655 0.2440655 0.2440655 ZT8-11 0.06021965 0.06021965 0.06021965 ZT12-15 0.6443175 0.6443175 0.6443175 ZT16-19 1.958375 1.958375 1.958375 ZT20-23 0.9312665 0.9312665 0.9312665