condition mean min max ZT0-3 0.8966970000000001 0.8966970000000001 0.8966970000000001 ZT4-7 0.6501875 0.6501875 0.6501875 ZT8-11 0.8848795 0.8848795 0.8848795 ZT12-15 1.061649 1.061649 1.061649 ZT16-19 0.7972144999999999 0.7972144999999999 0.7972144999999999 ZT20-23 0.714313 0.714313 0.714313