condition mean min max ZT0-3 832.186268 832.186268 832.186268 ZT4-7 430.874854 430.874854 430.874854 ZT8-11 483.3767375 483.3767375 483.3767375 ZT12-15 618.5052565 618.5052565 618.5052565 ZT16-19 817.5523029999999 817.5523029999999 817.5523029999999 ZT20-23 841.7320569999999 841.7320569999999 841.7320569999999