condition mean min max ZT0-3 3.3536335297499997 3.22044383 3.4868232294999997 ZT4-7 2.91363796075 2.4810514975 3.346224424 ZT8-11 3.0233761694999997 2.19471101 3.852041329 ZT12-15 3.791709061 3.1082159945 4.4752021275 ZT16-19 3.7411533500000003 3.3896543680000004 4.092652332 ZT20-23 5.5395534495000005 5.125416314000001 5.953690585