condition mean min max ZT0-3 251.3 251.3 251.3 ZT4-7 309.4 309.4 309.4 ZT8-11 337.20000000000005 337.20000000000005 337.20000000000005 ZT12-15 383.0 383.0 383.0 ZT16-19 345.0 345.0 345.0 ZT20-23 258.45000000000005 258.45000000000005 258.45000000000005