condition mean min max ZT0-3 0.6235120000000001 0.260626 1.089585 ZT4-7 0.2643455 0.2643455 0.2643455 ZT8-11 0.2676605 0.2676605 0.2676605 ZT12-15 2.6681825 2.494375 2.84199 ZT16-19 2.326121 2.326121 2.326121 ZT20-23 2.57104 2.57104 2.57104