condition mean min max ZT0-3 16.25 16.25 16.25 ZT4-7 20.5 20.5 20.5 ZT8-11 16.2 16.2 16.2 ZT12-15 4.699999999999999 4.699999999999999 4.699999999999999 ZT16-19 35.9 35.9 35.9 ZT20-23 10.8 10.8 10.8