condition mean min max ZT0-3 0.16551018333333334 0.04250485 0.2789055 ZT4-7 0.2073785 0.2073785 0.2073785 ZT8-11 0.9805349999999999 0.9805349999999999 0.9805349999999999 ZT12-15 1.00694025 0.9073305 1.10655 ZT16-19 0.48806799999999995 0.48806799999999995 0.48806799999999995 ZT20-23 0.22620864999999998 0.22620864999999998 0.22620864999999998