condition mean min max ZT0-3 857.594262 857.594262 857.594262 ZT4-7 1144.212826 1144.212826 1144.212826 ZT8-11 860.8549735 860.8549735 860.8549735 ZT12-15 631.2188 631.2188 631.2188 ZT16-19 548.7666234999999 548.7666234999999 548.7666234999999 ZT20-23 582.64801 582.64801 582.64801