condition mean min max ZT0-3 61.56189 61.56189 61.56189 ZT4-7 75.591746 75.591746 75.591746 ZT8-11 96.9731025 96.9731025 96.9731025 ZT12-15 88.80337850000001 88.80337850000001 88.80337850000001 ZT16-19 80.0675155 80.0675155 80.0675155 ZT20-23 59.0749055 59.0749055 59.0749055