condition mean min max ZT0-3 14.2177 14.2177 14.2177 ZT4-7 18.822000000000003 18.822000000000003 18.822000000000003 ZT8-11 12.25915 12.25915 12.25915 ZT12-15 6.681710000000001 6.681710000000001 6.681710000000001 ZT16-19 10.307 10.307 10.307 ZT20-23 9.336175 9.336175 9.336175