condition mean min max ZT0-3 54.4 54.4 54.4 ZT4-7 74.6 74.6 74.6 ZT8-11 81.0 81.0 81.0 ZT12-15 60.1 60.1 60.1 ZT16-19 44.0 44.0 44.0 ZT20-23 60.349999999999994 60.349999999999994 60.349999999999994