condition mean min max ZT0-3 7.773028 7.773028 7.773028 ZT4-7 7.715598 7.715598 7.715598 ZT8-11 7.297276500000001 7.297276500000001 7.297276500000001 ZT12-15 7.132441 7.132441 7.132441 ZT16-19 6.7799305 6.7799305 6.7799305 ZT20-23 7.948021000000001 7.948021000000001 7.948021000000001