condition mean min max ZT0-3 0.7283125 0.7283125 0.7283125 ZT4-7 0.452414 0.452414 0.452414 ZT8-11 0.3239035 0.3239035 0.3239035 ZT12-15 0.526948 0.526948 0.526948 ZT16-19 0.791774 0.791774 0.791774 ZT20-23 1.4664000000000001 1.4664000000000001 1.4664000000000001