condition mean min max ZT0-3 5.75396807725 4.2182844919999996 7.2896516625 ZT4-7 11.564728655 10.002089155 13.127368155 ZT8-11 14.0460064175 12.688707755 15.403305079999999 ZT12-15 10.1470190275 8.0125565895 12.2814814655 ZT16-19 7.244255733 6.342481677 8.146029789 ZT20-23 9.3403357405 9.190321724 9.490349757