query: SELECT ?item ?itemLabel ?value ?lower ?upper ?diff WHERE {
  	?item p:P5205/psv:P5205 [
  		wikibase:quantityAmount ?value;
  		wikibase:quantityLowerBound ?lower;
  		wikibase:quantityUpperBound ?upper
  	] .
  	BIND( ( ?upper - ?lower ) / 2 AS ?diff ) .
  	FILTER( ?item NOT IN ( wd:Q4115189, wd:Q13406268, wd:Q15397819 ) ) .
  	SERVICE wikibase:label { bd:serviceParam wikibase:language "en" } .
  }