condition mean min max ZT0-3 11.425966 11.425966 11.425966 ZT4-7 9.779569500000001 9.779569500000001 9.779569500000001 ZT8-11 12.079117 12.079117 12.079117 ZT12-15 11.0057435 11.0057435 11.0057435 ZT16-19 11.489908 11.489908 11.489908 ZT20-23 12.4996425 12.4996425 12.4996425