condition mean min max ZT0-3 1.2488392499999998 0.9865984999999999 1.5110799999999998 ZT4-7 0.3306835 0.3306835 0.3306835 ZT8-11 0.5025310000000001 0.5025310000000001 0.5025310000000001 ZT12-15 0 0 0 ZT16-19 0.8248085 0.8248085 0.8248085 ZT20-23 1.492025 1.492025 1.492025