condition mean min max ZT0-3 10.808614 10.808614 10.808614 ZT4-7 12.394527499999999 12.394527499999999 12.394527499999999 ZT8-11 11.082124 11.082124 11.082124 ZT12-15 11.332571000000002 11.332571000000002 11.332571000000002 ZT16-19 10.426026 10.426026 10.426026 ZT20-23 12.842120999999999 12.842120999999999 12.842120999999999