condition mean min max ZT0-3 0.6814306666666667 0.481083 0.990623 ZT4-7 0.3689205 0.3689205 0.3689205 ZT8-11 0.642828 0.642828 0.642828 ZT12-15 0.48311075 0.2776425 0.6885789999999999 ZT16-19 0.4299145 0.4299145 0.4299145 ZT20-23 0.692855 0.692855 0.692855