condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0260785 0.0 0.052157 ZT16-19 0.021015266666666668 0.0 0.042030533333333335 ZT20-23 0 0 0