condition mean min max ZT0-3 0.4927685 0.28659049999999997 0.648659 ZT4-7 0.44522 0.44522 0.44522 ZT8-11 0.5458455 0.5458455 0.5458455 ZT12-15 0.6937307500000001 0.644702 0.7427595 ZT16-19 0.952352 0.952352 0.952352 ZT20-23 1.26928 1.26928 1.26928