condition mean min max ZT0-3 24.961275 23.65615 26.2664 ZT4-7 29.6062 29.6062 29.6062 ZT8-11 24.144849999999998 24.144849999999998 24.144849999999998 ZT12-15 0 0 0 ZT16-19 21.314799999999998 21.314799999999998 21.314799999999998 ZT20-23 23.18205 23.18205 23.18205