condition mean min max ZT0-3 1.0828627499999999 0.5982525 1.567473 ZT4-7 7.60554 7.60554 7.60554 ZT8-11 3.546205 3.546205 3.546205 ZT12-15 0 0 0 ZT16-19 2.010335 2.010335 2.010335 ZT20-23 2.508995 2.508995 2.508995