condition mean min max ZT0-3 0.5828968333333333 0.4225805 0.8756539999999999 ZT4-7 1.559925 1.559925 1.559925 ZT8-11 0.45431299999999997 0.45431299999999997 0.45431299999999997 ZT12-15 1.3028115 1.288973 1.31665 ZT16-19 0.7101005 0.7101005 0.7101005 ZT20-23 0.7731330000000001 0.7731330000000001 0.7731330000000001