condition mean min max ZT0-3 261.45 261.45 261.45 ZT4-7 208.1 208.1 208.1 ZT8-11 241.05 241.05 241.05 ZT12-15 275.1 275.1 275.1 ZT16-19 291.9 291.9 291.9 ZT20-23 260.35 260.35 260.35