condition mean min max ZT0-3 251.95 251.95 251.95 ZT4-7 260.9 260.9 260.9 ZT8-11 197.9 197.9 197.9 ZT12-15 327.7 327.7 327.7 ZT16-19 283.75 283.75 283.75 ZT20-23 310.20000000000005 310.20000000000005 310.20000000000005