condition mean min max ZT0-3 12.918693333333334 10.378129999999999 15.5849 ZT4-7 11.3607 11.3607 11.3607 ZT8-11 20.8724 20.8724 20.8724 ZT12-15 33.713875 32.21205 35.2157 ZT16-19 23.68305 23.68305 23.68305 ZT20-23 19.83305 19.83305 19.83305