Table 2: Parameter estimates and fit indices for available twin data included in meta-analysis.

dfχ2AICMale Female Opposite-sex twins

Child-reported
 Full 6835.28−100.72.33 (.15, .52).14 (.00, .30).52 (.47, .58).36 (.21, .51).22 (.08, .35).43 (.38, .47).21 (.00, .05)1.0
 Full 6835.28−100.71.33 (.15, .52).14 (.00, .29).52 (.46, .58).36 (.21, .51).22 (.08, .35).43 (.38, .47).50 .43 (−.08, 1.0)
 Common6937.70−100.30.48 (.39, .54).01 (.00, .07).51 (.46, .57).35 (.19, .51).23 (.08, .36).43 (.38, .48).501.0
 Scalar7253.61−90.39.45 (.36, .56).07 (.00, .15).47 (.43, .51).45 (.36, .56).07 (.00, .15).47 (.43, .51).501.0
 am = af7040.19−99.81.46 (.35, .53).01 (.00, .10).53 (.47, .58).46 (.35, .53).13 (.05, .23).41 (.37, .46).501.0
 cm = cf7043.55−96.45.39 (.27, .50).08 (.00, .16).53 (.47, .59).50 (.39, .60).08 (.00, .16).42 (.38, .47).501.0
 em = ef7043.23−96.77.51 (.44, .56).02 (.00, .07).47 (.43, .51).27 (.13, .42).27 (.12, .39).47 (.43, .51).501.0
Parent-reported
 Full 2391.0045.00.31 (.17, .45).34 (.23, .47).34 (.30, .39).34 (.21, .46).37 (.26, .48).29 (.26, .33).48 (.24, .50)1.0
 Full 2391.0045.00.31 (.17, .44).34 (.23, .47).34 (.30, .39).34 (.21, .46).37 (.26, .48).29 (.26, .33).50.98 (.83, 1.0)
 Common2491.0443.04.33 (.17, .45).34 (.23, .46).34 (.30, .39).35 (.22, .46).36 (.26, .48).29 (.26, .33).501.0
 Scalar2794.7640.76.34 (.26, .42).35 (.28, .41).31 (.29, .34).34 (.27, .41).35 (.28, .41).31 (.29, .34).501.0

Note. Full : full sex-limitation model allowing for quantitative sex differences and qualitative genetic sex differences; Full : full sex-limitation model allowing for quantitative sex differences and qualitative shared environmental sex differences; Common: common effects model allowing for quantitative sex differences; Scalar: scalar model; AIC: Akaike’s information criterion; , , and : the proportion of variance in depressive symptoms explained by additive genetic, shared environmental, and nonshared environmental influences, respectively; : the genetic correlation among opposite-sex twin pairs; : the shared environmental correlation among opposite-sex twin pairs; 95% confidence intervals are shown in brackets.