condition mean min max ZT0-3 249.75 249.75 249.75 ZT4-7 250.5 250.5 250.5 ZT8-11 199.7 199.7 199.7 ZT12-15 288.05 288.05 288.05 ZT16-19 234.55 234.55 234.55 ZT20-23 324.65 324.65 324.65