condition mean min max ZT0-3 5.5709100000000005 2.1572199999999997 8.27771 ZT4-7 1.225465 1.225465 1.225465 ZT8-11 1.798428 1.798428 1.798428 ZT12-15 5.6945525 4.367465 7.02164 ZT16-19 8.996694999999999 8.996694999999999 8.996694999999999 ZT20-23 13.955400000000001 13.955400000000001 13.955400000000001