condition mean min max ZT0-3 0.7684845 0.7684845 0.7684845 ZT4-7 0.5343485 0.5343485 0.5343485 ZT8-11 0.4437745 0.4437745 0.4437745 ZT12-15 0.47401799999999994 0.47401799999999994 0.47401799999999994 ZT16-19 0.756761 0.756761 0.756761 ZT20-23 0.635007 0.635007 0.635007