condition mean min max ZT0-3 53.08045 50.777649999999994 55.383250000000004 ZT4-7 41.21895 41.21895 41.21895 ZT8-11 24.0109 24.0109 24.0109 ZT12-15 0 0 0 ZT16-19 28.1714 28.1714 28.1714 ZT20-23 51.34975 51.34975 51.34975