condition mean min max ZT0-3 53.45 53.45 53.45 ZT4-7 51.6 51.6 51.6 ZT8-11 45.599999999999994 45.599999999999994 45.599999999999994 ZT12-15 86.6 86.6 86.6 ZT16-19 64.69999999999999 64.69999999999999 64.69999999999999 ZT20-23 44.8 44.8 44.8