condition mean min max ZT0-3 0.638227 0.638227 0.638227 ZT4-7 2.50504 2.50504 2.50504 ZT8-11 0.771772 0.771772 0.771772 ZT12-15 0.7677455 0.7677455 0.7677455 ZT16-19 0.618247 0.618247 0.618247 ZT20-23 0.5030965000000001 0.5030965000000001 0.5030965000000001