condition mean min max ZT0-3 12.511800000000001 12.2447 12.7789 ZT4-7 12.1365 12.1365 12.1365 ZT8-11 13.4527 13.4527 13.4527 ZT12-15 0 0 0 ZT16-19 19.46245 19.46245 19.46245 ZT20-23 16.06815 16.06815 16.06815