condition mean min max ZT0-3 18505.783333333333 16980.85 20465.05 ZT4-7 19257.7 19257.7 19257.7 ZT8-11 16623.55 16623.55 16623.55 ZT12-15 17949.975 17566.85 18333.1 ZT16-19 20025.300000000003 20025.300000000003 20025.300000000003 ZT20-23 18367.9 18367.9 18367.9