condition mean min max ZT0-3 55.288781 55.288781 55.288781 ZT4-7 50.421246499999995 50.421246499999995 50.421246499999995 ZT8-11 55.69612 55.69612 55.69612 ZT12-15 58.890097499999996 58.890097499999996 58.890097499999996 ZT16-19 66.984789 66.984789 66.984789 ZT20-23 59.770735 59.770735 59.770735