condition mean min max ZT0-3 19.572000000000003 19.572000000000003 19.572000000000003 ZT4-7 16.55985 16.55985 16.55985 ZT8-11 12.94255 12.94255 12.94255 ZT12-15 14.90695 14.90695 14.90695 ZT16-19 18.3554 18.3554 18.3554 ZT20-23 16.89655 16.89655 16.89655