condition mean min max ZT0-3 7.590195 7.590195 7.590195 ZT4-7 4.975275 4.975275 4.975275 ZT8-11 6.663775 6.663775 6.663775 ZT12-15 6.604464999999999 6.604464999999999 6.604464999999999 ZT16-19 11.489899999999999 11.489899999999999 11.489899999999999 ZT20-23 7.82399 7.82399 7.82399