condition mean min max ZT0-3 0.298258 0.298258 0.298258 ZT4-7 0.1544455 0.1544455 0.1544455 ZT8-11 0.898266 0.898266 0.898266 ZT12-15 1.8026499999999999 1.8026499999999999 1.8026499999999999 ZT16-19 3.154495 3.154495 3.154495 ZT20-23 1.5965125 1.5965125 1.5965125