condition mean min max ZT0-3 0.131823 0.0 0.2676525 ZT4-7 0.1879345 0.1879345 0.1879345 ZT8-11 0.5605009999999999 0.5605009999999999 0.5605009999999999 ZT12-15 0.53122825 0.34906149999999997 0.713395 ZT16-19 0.836197 0.836197 0.836197 ZT20-23 0.350443 0.350443 0.350443