condition mean min max ZT0-3 12.117044 12.117044 12.117044 ZT4-7 12.853042 12.853042 12.853042 ZT8-11 13.693563 13.693563 13.693563 ZT12-15 12.9395965 12.9395965 12.9395965 ZT16-19 15.503752500000001 15.503752500000001 15.503752500000001 ZT20-23 13.374813 13.374813 13.374813