condition mean min max ZT0-3 2.52735 1.969775 2.909255 ZT4-7 0.9287895 0.9287895 0.9287895 ZT8-11 2.29371 2.29371 2.29371 ZT12-15 2.7050675 2.548435 2.8617000000000004 ZT16-19 1.8362105 1.8362105 1.8362105 ZT20-23 4.097110000000001 4.097110000000001 4.097110000000001