condition mean min max ZT0-3 54.3 54.3 54.3 ZT4-7 53.4 53.4 53.4 ZT8-11 62.699999999999996 62.699999999999996 62.699999999999996 ZT12-15 62.4 62.4 62.4 ZT16-19 66.25 66.25 66.25 ZT20-23 60.5 60.5 60.5