condition mean min max ZT0-3 14.758383333333335 12.41615 16.852800000000002 ZT4-7 12.9006 12.9006 12.9006 ZT8-11 10.450849999999999 10.450849999999999 10.450849999999999 ZT12-15 12.5643 11.879950000000001 13.24865 ZT16-19 13.8408 13.8408 13.8408 ZT20-23 17.1005 17.1005 17.1005