condition mean min max ZT0-3 19.09925 15.639949999999999 22.64685 ZT4-7 13.665849999999999 13.665849999999999 13.665849999999999 ZT8-11 22.056800000000003 22.056800000000003 22.056800000000003 ZT12-15 28.398925 28.0569 28.740949999999998 ZT16-19 27.04945 27.04945 27.04945 ZT20-23 25.32515 25.32515 25.32515