condition mean min max ZT0-3 9.811615 9.811615 9.811615 ZT4-7 10.313008 10.313008 10.313008 ZT8-11 11.190115 11.190115 11.190115 ZT12-15 10.815529999999999 10.815529999999999 10.815529999999999 ZT16-19 10.364268500000001 10.364268500000001 10.364268500000001 ZT20-23 11.763223499999999 11.763223499999999 11.763223499999999