condition mean min max ZT0-3 1.1537279999999999 1.0630395 1.2444164999999998 ZT4-7 1.8581100000000002 1.8581100000000002 1.8581100000000002 ZT8-11 3.907425 3.907425 3.907425 ZT12-15 0 0 0 ZT16-19 2.9385250000000003 2.9385250000000003 2.9385250000000003 ZT20-23 2.1362300000000003 2.1362300000000003 2.1362300000000003