condition mean min max ZT0-3 14.66815 13.8187 16.16315 ZT4-7 11.90085 11.90085 11.90085 ZT8-11 10.077115 10.077115 10.077115 ZT12-15 12.40505 11.672699999999999 13.1374 ZT16-19 11.7696 11.7696 11.7696 ZT20-23 16.06235 16.06235 16.06235