condition mean min max ZT0-3 0.6791625 0.6791625 0.6791625 ZT4-7 0.319574 0.319574 0.319574 ZT8-11 0.14232414999999998 0.14232414999999998 0.14232414999999998 ZT12-15 0.0787496 0.0787496 0.0787496 ZT16-19 0.221864 0.221864 0.221864 ZT20-23 0.4185015 0.4185015 0.4185015