condition mean min max ZT0-3 11.3 11.3 11.3 ZT4-7 16.1 16.1 16.1 ZT8-11 18.35 18.35 18.35 ZT12-15 74.05000000000001 74.05000000000001 74.05000000000001 ZT16-19 12.45 12.45 12.45 ZT20-23 9.7 9.7 9.7