condition mean min max ZT0-3 29.45 29.45 29.45 ZT4-7 13.3 13.3 13.3 ZT8-11 12.95 12.95 12.95 ZT12-15 16.35 16.35 16.35 ZT16-19 10.899999999999999 10.899999999999999 10.899999999999999 ZT20-23 17.15 17.15 17.15