condition mean min max ZT0-3 173.931155525 168.66003930000002 179.20227175 ZT4-7 135.492846175 133.8180525 137.16763985 ZT8-11 99.611595145 92.584207505 106.638982785 ZT12-15 95.783177425 95.47657623 96.08977862 ZT16-19 117.996181 111.91029790000002 124.0820641 ZT20-23 166.380592975 148.6861868 184.07499915