condition mean min max ZT0-3 12.481591054 12.31874192 12.644440188 ZT4-7 13.70010813 13.245834743333333 14.154381516666666 ZT8-11 11.5541913575 11.012797341666667 12.095585373333334 ZT12-15 12.237480319 11.84017736 12.634783277999999 ZT16-19 12.329701374999999 11.98297451 12.67642824 ZT20-23 14.315999058333333 13.270304726666666 15.361693390000001