condition mean min max ZT0-3 21.620733333333334 12.2597 29.591549999999998 ZT4-7 0.0 0.0 0.0 ZT8-11 29.63005 29.63005 29.63005 ZT12-15 22.1637 12.3398 31.9876 ZT16-19 11.2474 11.2474 11.2474 ZT20-23 38.063500000000005 38.063500000000005 38.063500000000005