condition mean min max ZT0-3 11.525238 11.525238 11.525238 ZT4-7 13.0450585 13.0450585 13.0450585 ZT8-11 11.8347445 11.8347445 11.8347445 ZT12-15 11.2360615 11.2360615 11.2360615 ZT16-19 12.081369500000001 12.081369500000001 12.081369500000001 ZT20-23 11.2834755 11.2834755 11.2834755