condition mean min max ZT0-3 2.5499525 2.33907 2.760835 ZT4-7 2.25586 2.25586 2.25586 ZT8-11 4.21122 4.21122 4.21122 ZT12-15 0 0 0 ZT16-19 4.799825 4.799825 4.799825 ZT20-23 3.789865 3.789865 3.789865