condition mean min max ZT0-3 0.130104 0.0 0.264294 ZT4-7 0.240653 0.240653 0.240653 ZT8-11 0.0 0.0 0.0 ZT12-15 0.32968575 0.2802425 0.379129 ZT16-19 0.3628705 0.3628705 0.3628705 ZT20-23 0.404365 0.404365 0.404365