condition mean min max ZT0-3 2.04759 2.04759 2.04759 ZT4-7 1.901905 1.901905 1.901905 ZT8-11 1.229625 1.229625 1.229625 ZT12-15 1.2885849999999999 1.2885849999999999 1.2885849999999999 ZT16-19 1.13921 1.13921 1.13921 ZT20-23 1.99506 1.99506 1.99506