condition mean min max ZT0-3 0.539402 0.3051015 0.7664445 ZT4-7 0.124811 0.124811 0.124811 ZT8-11 0.409102 0.409102 0.409102 ZT12-15 0.41120325 0.314478 0.5079285 ZT16-19 0.11853 0.11853 0.11853 ZT20-23 0.265365 0.265365 0.265365