condition mean min max ZT0-3 0.014491675 0.0 0.02898335 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.012271633333333332 0.0 0.024543266666666664 ZT16-19 0.0 0.0 0.0 ZT20-23 0 0 0