condition mean min max ZT0-3 0.39197116666666665 0.17119499999999999 0.6814359999999999 ZT4-7 0.33225899999999997 0.33225899999999997 0.33225899999999997 ZT8-11 0.8602615 0.8602615 0.8602615 ZT12-15 1.30344225 1.27408 1.3328045 ZT16-19 1.4141849999999998 1.4141849999999998 1.4141849999999998 ZT20-23 1.227125 1.227125 1.227125