condition mean min max ZT0-3 42.82143333333333 19.52505 58.23125 ZT4-7 22.447499999999998 22.447499999999998 22.447499999999998 ZT8-11 5.68389 5.68389 5.68389 ZT12-15 13.956475000000001 13.2612 14.65175 ZT16-19 15.05835 15.05835 15.05835 ZT20-23 37.4913 37.4913 37.4913