condition mean min max ZT0-3 23.65 23.65 23.65 ZT4-7 34.2 34.2 34.2 ZT8-11 55.75 55.75 55.75 ZT12-15 46.9 46.9 46.9 ZT16-19 44.849999999999994 44.849999999999994 44.849999999999994 ZT20-23 31.25 31.25 31.25