condition mean min max ZT0-3 618.780783 618.780783 618.780783 ZT4-7 548.7308565 548.7308565 548.7308565 ZT8-11 664.1100670000001 664.1100670000001 664.1100670000001 ZT12-15 618.401462 618.401462 618.401462 ZT16-19 899.6577279999999 899.6577279999999 899.6577279999999 ZT20-23 815.251445 815.251445 815.251445