condition mean min max ZT0-3 1.9954375 1.834175 2.1567 ZT4-7 1.746705 1.746705 1.746705 ZT8-11 2.5855550000000003 2.5855550000000003 2.5855550000000003 ZT12-15 0 0 0 ZT16-19 3.083455 3.083455 3.083455 ZT20-23 1.928925 1.928925 1.928925