condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.021160036333333337 0.0 0.042320072666666673 ZT8-11 0.012453494 0.0 0.024906988 ZT12-15 0.0125869665 0.0 0.025173933 ZT16-19 0.011913511500000001 0.0 0.023827023000000003 ZT20-23 0.03178534266666667 0.021296145 0.04227454033333333