condition mean min max ZT0-3 13.936573 13.936573 13.936573 ZT4-7 14.7422865 14.7422865 14.7422865 ZT8-11 15.9802025 15.9802025 15.9802025 ZT12-15 14.378717 14.378717 14.378717 ZT16-19 14.083697 14.083697 14.083697 ZT20-23 16.911334 16.911334 16.911334