condition mean min max ZT0-3 13.09215 7.29345 16.88975 ZT4-7 7.033849999999999 7.033849999999999 7.033849999999999 ZT8-11 5.786605 5.786605 5.786605 ZT12-15 7.505 6.139265 8.870735 ZT16-19 11.320599999999999 11.320599999999999 11.320599999999999 ZT20-23 17.3759 17.3759 17.3759