condition mean min max ZT0-3 0.9956065000000001 0.9956065000000001 0.9956065000000001 ZT4-7 0.514147 0.514147 0.514147 ZT8-11 1.289985 1.289985 1.289985 ZT12-15 1.8887999999999998 1.8887999999999998 1.8887999999999998 ZT16-19 2.248475 2.248475 2.248475 ZT20-23 2.30425 2.30425 2.30425