condition mean min max ZT0-3 0.806362 0.806362 0.806362 ZT4-7 1.021995 1.021995 1.021995 ZT8-11 2.6421755 2.6421755 2.6421755 ZT12-15 1.8542299999999998 1.8542299999999998 1.8542299999999998 ZT16-19 0.4436705 0.4436705 0.4436705 ZT20-23 1.548515 1.548515 1.548515