condition mean min max ZT0-3 0.9377155 0.7852475 1.0379930000000002 ZT4-7 1.085 1.085 1.085 ZT8-11 1.820025 1.820025 1.820025 ZT12-15 1.09868175 0.9610935 1.23627 ZT16-19 0.949754 0.949754 0.949754 ZT20-23 1.089345 1.089345 1.089345