condition mean min max ZT0-3 49.061318 49.061318 49.061318 ZT4-7 27.188001999999997 27.188001999999997 27.188001999999997 ZT8-11 28.684706 28.684706 28.684706 ZT12-15 24.6948875 24.6948875 24.6948875 ZT16-19 40.839948 40.839948 40.839948 ZT20-23 41.163079 41.163079 41.163079