condition mean min max ZT0-3 113.872531 113.872531 113.872531 ZT4-7 109.8859055 109.8859055 109.8859055 ZT8-11 130.400353 130.400353 130.400353 ZT12-15 118.4285795 118.4285795 118.4285795 ZT16-19 124.0094765 124.0094765 124.0094765 ZT20-23 118.9333315 118.9333315 118.9333315