condition mean min max ZT0-3 5.825165 5.825165 5.825165 ZT4-7 3.845955 3.845955 3.845955 ZT8-11 1.824615 1.824615 1.824615 ZT12-15 2.244675 2.244675 2.244675 ZT16-19 4.71852 4.71852 4.71852 ZT20-23 7.282375 7.282375 7.282375