Pet ownership by life group.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000704:Analysis of Variance; D000818:Animals; D000829:Animals, Domestic; D002415:Cats; D002648:Child; D002675:Child, Preschool; D004285:Dogs; D005191:Family Characteristics; D005260:Female; D006798:Housing; D001841:Human-Animal Bond; D006801:Humans; D007223:Infant; D008297:Male; D008393:Marriage; D008875:Middle Aged; D011336:Probability; D012959:Socioeconomic Factors; D014730:Veterinary Medicine / Q000191:economics* / Q000639:trends