condition mean min max ZT0-3 1.2061068333333334 0.3503705 1.98041 ZT4-7 1.22403 1.22403 1.22403 ZT8-11 0.4505825 0.4505825 0.4505825 ZT12-15 1.3495825 1.219515 1.47965 ZT16-19 0.78635 0.78635 0.78635 ZT20-23 0.964146 0.964146 0.964146