condition mean min max ZT0-3 0.77502608375 0.35904619299999996 1.1910059745000001 ZT4-7 1.7546167430000001 1.4462440445 2.0629894415 ZT8-11 3.99617881 2.3780601734999998 5.6142974465 ZT12-15 9.320497865250001 7.783263732 10.8577319985 ZT16-19 4.857121413000001 4.320905675500001 5.393337150500001 ZT20-23 3.679924703 3.2520101415 4.1078392645