condition mean min max ZT0-3 45.591038 45.591038 45.591038 ZT4-7 33.045619 33.045619 33.045619 ZT8-11 25.309846999999998 25.309846999999998 25.309846999999998 ZT12-15 24.2519215 24.2519215 24.2519215 ZT16-19 21.2905875 21.2905875 21.2905875 ZT20-23 20.0373445 20.0373445 20.0373445