lower respiratory tract infection lower respiratory tract infections lower response lower return lower returns lower rhine lower ribs lower right lower right corner lower right hand lower right side lower right-hand lower rim lower ring lower risk lower risk of death lower risk of developing lower risk of heart lower risks lower river lower roller lower rollers lower room lower row lower running lower salaries lower salary lower sales lower salt lower saxon lower saxony lower school lower score lower scores lower screen lower seat lower second lower secondary lower secondary education lower secondary level lower secondary school lower secondary schools lower section lower security lower segment lower self lower self-esteem lower sensitivity lower set lower setting lower shabelle lower shaft lower sheet lower shelf lower shell lower shelves lower side lower sides lower silesia lower silesian lower skin lower slopes lower social lower socio-economic lower socioeconomic lower sorbian lower south lower space lower specific lower speed lower speeds lower spending lower spine lower spring lower stage lower standard lower standards lower starting lower state lower station lower status lower still lower stomach lower stop lower storage lower strata lower strength lower stress lower stress levels lower substrate lower sugar lower supply lower support lower surface lower surfaces lower survival lower suspension lower table lower tank