condition mean min max ZT0-3 11.074471 11.074471 11.074471 ZT4-7 12.036103 12.036103 12.036103 ZT8-11 11.264882499999999 11.264882499999999 11.264882499999999 ZT12-15 11.911238 11.911238 11.911238 ZT16-19 11.303956 11.303956 11.303956 ZT20-23 11.4161015 11.4161015 11.4161015