condition mean min max ZT0-3 1.92418 1.92418 1.92418 ZT4-7 1.182555 1.182555 1.182555 ZT8-11 2.046985 2.046985 2.046985 ZT12-15 0.9711865 0.9711865 0.9711865 ZT16-19 1.70054 1.70054 1.70054 ZT20-23 1.99865 1.99865 1.99865