condition mean min max ZT0-3 6.4418625 6.435105 6.44862 ZT4-7 6.821225 6.821225 6.821225 ZT8-11 6.48593 6.48593 6.48593 ZT12-15 0 0 0 ZT16-19 8.03588 8.03588 8.03588 ZT20-23 8.980075 8.980075 8.980075