condition mean min max ZT0-3 345.432408 345.432408 345.432408 ZT4-7 314.5507015 314.5507015 314.5507015 ZT8-11 322.052527 322.052527 322.052527 ZT12-15 356.8456885 356.8456885 356.8456885 ZT16-19 464.4304745 464.4304745 464.4304745 ZT20-23 462.776981 462.776981 462.776981