condition mean min max ZT0-3 15.81695 15.81695 15.81695 ZT4-7 20.63785 20.63785 20.63785 ZT8-11 10.896149999999999 10.896149999999999 10.896149999999999 ZT12-15 10.321235000000001 10.321235000000001 10.321235000000001 ZT16-19 14.0192 14.0192 14.0192 ZT20-23 13.20205 13.20205 13.20205