condition mean min max ZT0-3 1.2602060000000002 1.2602060000000002 1.2602060000000002 ZT4-7 1.080071 1.080071 1.080071 ZT8-11 0.453894 0.453894 0.453894 ZT12-15 0.74637 0.74637 0.74637 ZT16-19 1.8202369999999999 1.8202369999999999 1.8202369999999999 ZT20-23 0.7952443333333333 0.7952443333333333 0.7952443333333333