Model-fitting results for hoarding symptoms in Swedish twins at age 15 years.

Note:The General Sex Limitation Model tested for qualitative and quantitative sex differences.*Testing for the presence of qualitative genetic effects across sexes.**Testing for the presence of qualitative shared environmental effects across sexes.The Common Effects Sex Limitation Model tested for quantitative sex differences and the No Effects Sex Limitation Model tested for no differences across sexes.The best fitting model is bolded.−2LL = minus twice the log likelihood; χ2 = differences in −2LL statistic between submodel and full model; Δ df = change in degrees of freedom between submodel and full model; p = probability; AIC = Akaike Information Criterion.