condition mean min max ZT0-3 0.44244150000000004 0.2505445 0.6343385 ZT4-7 2.267445 2.267445 2.267445 ZT8-11 0.752825 0.752825 0.752825 ZT12-15 0 0 0 ZT16-19 1.2485065 1.2485065 1.2485065 ZT20-23 1.256407 1.256407 1.256407