condition mean min max ZT0-3 0.033746 0.0 0.067492 ZT4-7 0.038858 0.038858 0.038858 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.020689 0.0 0.041378 ZT20-23 0 0 0