condition mean min max ZT0-3 11.97165 11.53895 12.40435 ZT4-7 12.978200000000001 12.978200000000001 12.978200000000001 ZT8-11 12.7959 12.7959 12.7959 ZT12-15 0 0 0 ZT16-19 13.19265 13.19265 13.19265 ZT20-23 12.19795 12.19795 12.19795