condition mean min max ZT0-3 18.1069 18.1069 18.1069 ZT4-7 24.10985 24.10985 24.10985 ZT8-11 10.125785 10.125785 10.125785 ZT12-15 12.59665 12.59665 12.59665 ZT16-19 7.99534 7.99534 7.99534 ZT20-23 15.07105 15.07105 15.07105