condition mean min max ZT0-3 735.0511666666666 489.746 882.5015 ZT4-7 377.275 377.275 377.275 ZT8-11 349.7015 349.7015 349.7015 ZT12-15 478.0665 449.4045 506.7285 ZT16-19 622.0 622.0 622.0 ZT20-23 876.1275 876.1275 876.1275