condition mean min max ZT0-3 14.45 14.45 14.45 ZT4-7 11.9 11.9 11.9 ZT8-11 23.5 23.5 23.5 ZT12-15 8.25 8.25 8.25 ZT16-19 5.1 5.1 5.1 ZT20-23 10.5 10.5 10.5