condition mean min max ZT0-3 132.95973564 75.39970053 190.51977075 ZT4-7 429.8347716 348.7155738 510.9539694 ZT8-11 1063.2238101 875.7903031999999 1250.6573170000001 ZT12-15 1434.0514537499998 1209.7017799999999 1658.4011275 ZT16-19 762.52964775 572.0929495 952.9663459999999 ZT20-23 317.92305987500004 252.39155295 383.45456680000007