condition mean min max ZT0-3 2.5157499999999997 2.5157499999999997 2.5157499999999997 ZT4-7 1.8603200000000002 1.8603200000000002 1.8603200000000002 ZT8-11 1.708145 1.708145 1.708145 ZT12-15 2.2091450000000004 2.2091450000000004 2.2091450000000004 ZT16-19 4.039425 4.039425 4.039425 ZT20-23 2.8893250000000004 2.8893250000000004 2.8893250000000004