In the SOS reference study , subjects homozygous for the d@-GHR weighed @kg more ( P = @ ) , and had larger waist-to-hip ratio ( WHR , P = @ ) , larger waist circumference ( P = @ ) , and more fat-free mass estimated from total body potassium ( P = @ ) than grouped fl/d@ and fl/fl subjects ( d@-recessive genetic model ) .