condition mean min max ZT0-3 1.6382781666666668 1.2862595000000001 1.8197450000000002 ZT4-7 1.0216775 1.0216775 1.0216775 ZT8-11 0.7613105 0.7613105 0.7613105 ZT12-15 1.112784 0.732178 1.4933900000000002 ZT16-19 1.0104145 1.0104145 1.0104145 ZT20-23 1.27269 1.27269 1.27269