condition mean min max ZT0-3 17.06152 17.06152 17.06152 ZT4-7 15.4274485 15.4274485 15.4274485 ZT8-11 19.2116465 19.2116465 19.2116465 ZT12-15 16.7607535 16.7607535 16.7607535 ZT16-19 17.034945 17.034945 17.034945 ZT20-23 19.3167265 19.3167265 19.3167265