condition mean min max ZT0-3 1.258655 1.258655 1.258655 ZT4-7 0.6648455 0.6648455 0.6648455 ZT8-11 0.959437 0.959437 0.959437 ZT12-15 1.66048 1.66048 1.66048 ZT16-19 2.044925 2.044925 2.044925 ZT20-23 1.82444 1.82444 1.82444