condition mean min max ZT0-3 14.81551 14.81551 14.81551 ZT4-7 13.9505275 13.9505275 13.9505275 ZT8-11 15.0526835 15.0526835 15.0526835 ZT12-15 14.2412435 14.2412435 14.2412435 ZT16-19 17.168003 17.168003 17.168003 ZT20-23 15.7874085 15.7874085 15.7874085