condition mean min max ZT0-3 17.267049999999998 16.6692 17.8649 ZT4-7 14.49095 14.49095 14.49095 ZT8-11 8.860855 8.860855 8.860855 ZT12-15 0 0 0 ZT16-19 15.40645 15.40645 15.40645 ZT20-23 13.081949999999999 13.081949999999999 13.081949999999999