condition mean min max ZT0-3 35.08938333333333 17.01905 47.31125 ZT4-7 13.943000000000001 13.943000000000001 13.943000000000001 ZT8-11 14.5754 14.5754 14.5754 ZT12-15 20.70045 17.3881 24.0128 ZT16-19 28.92745 28.92745 28.92745 ZT20-23 53.37635 53.37635 53.37635