condition mean min max ZT0-3 0.96798325 0.96798325 0.96798325 ZT4-7 1.0314455 1.0314455 1.0314455 ZT8-11 0.9057805 0.9057805 0.9057805 ZT12-15 1.04680325 1.04680325 1.04680325 ZT16-19 0.9659445 0.9659445 0.9659445 ZT20-23 0.9697702500000001 0.9697702500000001 0.9697702500000001