condition mean min max ZT0-3 385.314486 385.314486 385.314486 ZT4-7 489.582952 489.582952 489.582952 ZT8-11 512.8529585 512.8529585 512.8529585 ZT12-15 465.613828 465.613828 465.613828 ZT16-19 488.8147375 488.8147375 488.8147375 ZT20-23 467.24133700000004 467.24133700000004 467.24133700000004