condition mean min max ZT0-3 11.9353 11.3431 12.5275 ZT4-7 12.583 12.583 12.583 ZT8-11 13.16145 13.16145 13.16145 ZT12-15 0 0 0 ZT16-19 13.52245 13.52245 13.52245 ZT20-23 14.9932 14.9932 14.9932