condition mean min max ZT0-3 52.78595 52.6857 52.8862 ZT4-7 71.596 71.596 71.596 ZT8-11 57.2093 57.2093 57.2093 ZT12-15 0 0 0 ZT16-19 41.4005 41.4005 41.4005 ZT20-23 64.4876 64.4876 64.4876