condition mean min max ZT0-3 36.2 36.2 36.2 ZT4-7 39.0 39.0 39.0 ZT8-11 48.45 48.45 48.45 ZT12-15 54.45 54.45 54.45 ZT16-19 46.099999999999994 46.099999999999994 46.099999999999994 ZT20-23 46.3 46.3 46.3