condition mean min max ZT0-3 11.558736666666666 5.29546 16.4241 ZT4-7 6.06518 6.06518 6.06518 ZT8-11 6.72977 6.72977 6.72977 ZT12-15 10.7974925 9.531735000000001 12.06325 ZT16-19 11.1508 11.1508 11.1508 ZT20-23 17.2106 17.2106 17.2106