condition mean min max ZT0-3 3.87853 3.8633450000000003 3.893715 ZT4-7 6.067365 6.067365 6.067365 ZT8-11 5.1630400000000005 5.1630400000000005 5.1630400000000005 ZT12-15 0 0 0 ZT16-19 7.50123 7.50123 7.50123 ZT20-23 7.539289999999999 7.539289999999999 7.539289999999999