condition mean min max ZT0-3 47.38495 39.70975 55.06015 ZT4-7 14.3574 14.3574 14.3574 ZT8-11 30.848750000000003 30.848750000000003 30.848750000000003 ZT12-15 0 0 0 ZT16-19 30.24955 30.24955 30.24955 ZT20-23 51.5482 51.5482 51.5482