condition mean min max ZT0-3 16.8 16.8 16.8 ZT4-7 20.2 20.2 20.2 ZT8-11 4.1 4.1 4.1 ZT12-15 12.8 12.8 12.8 ZT16-19 8.25 8.25 8.25 ZT20-23 5.699999999999999 5.699999999999999 5.699999999999999