condition mean min max ZT0-3 70.2939737675 57.630742135000006 82.9572054 ZT4-7 29.6967617375 28.494011405000002 30.89951207 ZT8-11 23.145608277500003 21.040894315 25.250322240000003 ZT12-15 12.96207204475 12.14782829 13.7763157995 ZT16-19 36.7931973325 28.277696945000002 45.30869772 ZT20-23 66.143740175 63.465465005 68.822015345