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 0.010494141 0.0 0.020988282 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0133948445 0.0 0.026789689