condition mean min max ZT0-3 0.0342654545 0.0 0.068530909 ZT4-7 0.28310465425 0.26570735599999995 0.3005019525 ZT8-11 2.2442240475 1.0746463769999999 3.413801718 ZT12-15 5.728462947 4.751979248 6.704946646 ZT16-19 2.1029001275000003 1.793988555 2.4118117000000003 ZT20-23 0.76913798 0.1644284855 1.3738474745