condition mean min max ZT0-3 5.29279376925 5.01113236 5.5744551785 ZT4-7 10.54156769025 7.6554938855 13.427641495 ZT8-11 17.050627615 14.6535036 19.44775163 ZT12-15 11.72489246975 9.8982026715 13.551582268 ZT16-19 5.2303092630000005 5.1098271425 5.350791383500001 ZT20-23 4.42746876375 4.210748554 4.6441889735