condition mean min max ZT0-3 0.20034726449999998 0.0 0.40069452899999997 ZT4-7 0.288488868 0.0 0.576977736 ZT8-11 0.9152448225 0.3423234075 1.4881662375 ZT12-15 1.41787849 1.284641696 1.551115284 ZT16-19 0.93229683975 0.7472830855 1.1173105939999999 ZT20-23 0.75554266425 0.6498938685 0.86119146