condition mean min max ZT0-3 4.0637525 4.002535 4.124969999999999 ZT4-7 2.852605 2.852605 2.852605 ZT8-11 1.99448 1.99448 1.99448 ZT12-15 0 0 0 ZT16-19 3.7449700000000004 3.7449700000000004 3.7449700000000004 ZT20-23 4.39006 4.39006 4.39006