condition mean min max ZT0-3 82.592672 82.592672 82.592672 ZT4-7 68.29538 68.29538 68.29538 ZT8-11 84.61569 84.61569 84.61569 ZT12-15 122.3142505 122.3142505 122.3142505 ZT16-19 94.622079 94.622079 94.622079 ZT20-23 162.837773 162.837773 162.837773