condition mean min max ZT0-3 52.587926 52.587926 52.587926 ZT4-7 71.5211655 71.5211655 71.5211655 ZT8-11 82.6611955 82.6611955 82.6611955 ZT12-15 75.2302255 75.2302255 75.2302255 ZT16-19 116.35053500000001 116.35053500000001 116.35053500000001 ZT20-23 126.71632550000001 126.71632550000001 126.71632550000001