condition mean min max ZT0-3 11.813400000000001 11.4981 12.1287 ZT4-7 12.1644 12.1644 12.1644 ZT8-11 14.856 14.856 14.856 ZT12-15 0 0 0 ZT16-19 13.32765 13.32765 13.32765 ZT20-23 12.7987 12.7987 12.7987