condition mean min max ZT0-3 4.35 4.35 4.35 ZT4-7 13.2 13.2 13.2 ZT8-11 14.899999999999999 14.899999999999999 14.899999999999999 ZT12-15 23.0 23.0 23.0 ZT16-19 17.35 17.35 17.35 ZT20-23 27.7 27.7 27.7