condition mean min max ZT0-3 1.85014 1.497785 2.202495 ZT4-7 1.254675 1.254675 1.254675 ZT8-11 1.75864 1.75864 1.75864 ZT12-15 0 0 0 ZT16-19 1.615425 1.615425 1.615425 ZT20-23 2.157245 2.157245 2.157245