condition mean min max ZT0-3 0.86201664275 0.35335307200000005 1.3706802135 ZT4-7 3.18330160925 2.657350068 3.7092531505000004 ZT8-11 4.11122332725 3.2115577770000003 5.010888877499999 ZT12-15 13.07934739775 10.5868702305 15.571824565 ZT16-19 12.972634589999998 12.345739524999999 13.599529655 ZT20-23 16.09939413 14.652495909999999 17.54629235