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 0.015935916666666668 0.0 0.031871833333333335 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0