condition mean min max ZT0-3 25.695675 24.361400000000003 27.02995 ZT4-7 26.762700000000002 26.762700000000002 26.762700000000002 ZT8-11 32.55445 32.55445 32.55445 ZT12-15 0 0 0 ZT16-19 36.3371 36.3371 36.3371 ZT20-23 26.73415 26.73415 26.73415