condition mean min max ZT0-3 9.918354 9.918354 9.918354 ZT4-7 10.535985499999999 10.535985499999999 10.535985499999999 ZT8-11 9.6962685 9.6962685 9.6962685 ZT12-15 10.901052499999999 10.901052499999999 10.901052499999999 ZT16-19 9.297941 9.297941 9.297941 ZT20-23 10.109581 10.109581 10.109581