condition mean min max ZT0-3 11.504999999999999 11.504999999999999 11.504999999999999 ZT4-7 13.9771 13.9771 13.9771 ZT8-11 8.71063 8.71063 8.71063 ZT12-15 3.939195 3.939195 3.939195 ZT16-19 6.133035 6.133035 6.133035 ZT20-23 6.662039999999999 6.662039999999999 6.662039999999999