condition mean min max ZT0-3 24.451868 24.451868 24.451868 ZT4-7 16.5174155 16.5174155 16.5174155 ZT8-11 16.114541 16.114541 16.114541 ZT12-15 15.7485165 15.7485165 15.7485165 ZT16-19 15.726461 15.726461 15.726461 ZT20-23 19.159050999999998 19.159050999999998 19.159050999999998