condition mean min max ZT0-3 384.592575 384.592575 384.592575 ZT4-7 464.920527 464.920527 464.920527 ZT8-11 472.2062465 472.2062465 472.2062465 ZT12-15 529.733373 529.733373 529.733373 ZT16-19 502.4013765 502.4013765 502.4013765 ZT20-23 378.463617 378.463617 378.463617