condition mean min max ZT0-3 0.9445285000000001 0.9445285000000001 0.9445285000000001 ZT4-7 0.5239 0.5239 0.5239 ZT8-11 0.3093735 0.3093735 0.3093735 ZT12-15 0.9826545 0.9826545 0.9826545 ZT16-19 0.30553050000000004 0.30553050000000004 0.30553050000000004 ZT20-23 1.5570050000000002 1.5570050000000002 1.5570050000000002