condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.962455 0.962455 0.962455 ZT12-15 0.0 0.0 0.0 ZT16-19 2.084525 2.084525 2.084525 ZT20-23 2.059455 2.059455 2.059455