condition mean min max ZT0-3 57.096475 45.34965 68.8433 ZT4-7 82.3183 82.3183 82.3183 ZT8-11 90.03635 90.03635 90.03635 ZT12-15 0 0 0 ZT16-19 72.2301 72.2301 72.2301 ZT20-23 59.30244999999999 59.30244999999999 59.30244999999999