condition mean min max ZT0-3 143.173941 143.173941 143.173941 ZT4-7 233.8214865 233.8214865 233.8214865 ZT8-11 177.80375850000001 177.80375850000001 177.80375850000001 ZT12-15 186.486359 186.486359 186.486359 ZT16-19 569.6015515 569.6015515 569.6015515 ZT20-23 883.6981525 883.6981525 883.6981525