condition mean min max ZT0-3 0.08829895 0.0443442 0.1322537 ZT4-7 0.0225716 0.0225716 0.0225716 ZT8-11 0.065749 0.065749 0.065749 ZT12-15 0 0 0 ZT16-19 0.17439500000000002 0.17439500000000002 0.17439500000000002 ZT20-23 0.02200115 0.02200115 0.02200115