condition mean min max ZT0-3 39.849999999999994 39.849999999999994 39.849999999999994 ZT4-7 7.6 7.6 7.6 ZT8-11 73.9 73.9 73.9 ZT12-15 49.0 49.0 49.0 ZT16-19 48.55 48.55 48.55 ZT20-23 57.599999999999994 57.599999999999994 57.599999999999994