condition mean min max ZT0-3 0.9721806666666666 0.8578479999999999 1.141972 ZT4-7 0.726437 0.726437 0.726437 ZT8-11 0.522848 0.522848 0.522848 ZT12-15 0.6072647499999999 0.46298799999999996 0.7515415 ZT16-19 0.742378 0.742378 0.742378 ZT20-23 0.8902795 0.8902795 0.8902795