condition mean min max ZT0-3 32.7 32.7 32.7 ZT4-7 26.8 26.8 26.8 ZT8-11 41.099999999999994 41.099999999999994 41.099999999999994 ZT12-15 53.5 53.5 53.5 ZT16-19 55.4 55.4 55.4 ZT20-23 47.5 47.5 47.5