condition mean min max ZT0-3 458.454876 458.454876 458.454876 ZT4-7 466.12569800000006 466.12569800000006 466.12569800000006 ZT8-11 277.9312345 277.9312345 277.9312345 ZT12-15 369.36073250000004 369.36073250000004 369.36073250000004 ZT16-19 150.89189 150.89189 150.89189 ZT20-23 104.5229115 104.5229115 104.5229115