condition mean min max ZT0-3 6.12896309075 5.5781709665 6.679755215 ZT4-7 6.53419472425 5.424492308 7.6438971405 ZT8-11 7.81134126075 7.135950985 8.486731536499999 ZT12-15 9.248529908999998 7.643580762999999 10.853479055 ZT16-19 8.969261496000001 7.8401746285 10.098348363500001 ZT20-23 10.35816563575 9.678612941499999 11.03771833