condition mean min max ZT0-3 5.0345825 4.79738 5.2717849999999995 ZT4-7 5.09721 5.09721 5.09721 ZT8-11 5.996435 5.996435 5.996435 ZT12-15 0 0 0 ZT16-19 7.17254 7.17254 7.17254 ZT20-23 4.95646 4.95646 4.95646