condition mean min max ZT0-3 22.0889 20.3037 25.3574 ZT4-7 14.62905 14.62905 14.62905 ZT8-11 12.2726 12.2726 12.2726 ZT12-15 17.815825 16.584850000000003 19.046799999999998 ZT16-19 19.8467 19.8467 19.8467 ZT20-23 26.16805 26.16805 26.16805