condition mean min max ZT0-3 37.27845 35.8849 38.672 ZT4-7 24.7961 24.7961 24.7961 ZT8-11 13.9985 13.9985 13.9985 ZT12-15 0 0 0 ZT16-19 30.3945 30.3945 30.3945 ZT20-23 33.51245 33.51245 33.51245