condition mean min max ZT0-3 12.1736 12.1736 12.1736 ZT4-7 12.271312 12.271312 12.271312 ZT8-11 12.3740515 12.3740515 12.3740515 ZT12-15 14.213076000000001 14.213076000000001 14.213076000000001 ZT16-19 12.6531475 12.6531475 12.6531475 ZT20-23 11.0447035 11.0447035 11.0447035