condition mean min max ZT0-3 564.390419 564.390419 564.390419 ZT4-7 486.664317 486.664317 486.664317 ZT8-11 623.319136 623.319136 623.319136 ZT12-15 642.886931 642.886931 642.886931 ZT16-19 679.4854555 679.4854555 679.4854555 ZT20-23 708.8047185 708.8047185 708.8047185