The natural course of gonarthritis.
D000367:Age Factors; D000368:Aged; D001168:Arthritis / Q000453:epidemiology / Q000473:pathology*; D005260:Female; D006801:Humans; D007564:Japan; D007719:Knee Joint / Q000473:pathology*; D008019:Life Style; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D013997:Time Factors