condition mean min max ZT0-3 13.03405 13.03405 13.03405 ZT4-7 11.8174 11.8174 11.8174 ZT8-11 8.24624 8.24624 8.24624 ZT12-15 9.81663 9.81663 9.81663 ZT16-19 13.51505 13.51505 13.51505 ZT20-23 14.3798 14.3798 14.3798