condition mean min max ZT0-3 5.09373 3.202095 6.371335 ZT4-7 3.753895 3.753895 3.753895 ZT8-11 4.11709 4.11709 4.11709 ZT12-15 6.65006 6.39159 6.90853 ZT16-19 7.06541 7.06541 7.06541 ZT20-23 9.07833 9.07833 9.07833