condition mean min max ZT0-3 13.26175 13.26175 13.26175 ZT4-7 10.61055 10.61055 10.61055 ZT8-11 9.346475 9.346475 9.346475 ZT12-15 11.4076 11.4076 11.4076 ZT16-19 12.2282 12.2282 12.2282 ZT20-23 13.63695 13.63695 13.63695