Table 6

Differential item functioning positive and negative symptoms: reference group = USA vs. focal group = Northern Europe, Southern Europe, Russia & Ukraine, India, Eastern Asia
Northern Europe Southern Europe Russia & Ukraine India Eastern Asia
Item Chi-sq p-value E.S. (95% C.I.) Class Chi-sq p-value E.S. (95% C.I.) Class Chi-sq p-value E.S. (95% C.I.) Class Chi-sq p-value E.S. (95% C.I.) Class Chi-sq p-value E.S. (95% C.I.) Class
G1 17.54* <0.001 0.73 (0.40;1.06) CC+ 1.74 0.19 0.19 (−0.09;0.48) AA 12.94* < 0.001 0.46 (0.23;0.69) BB+ 1.07 0.3 0.15 (−0.09;0.39) AA 12.67* <0.001 0.50 (0.24;0.76) BB+
G2 21.95* <0.001 −0.55 (−0.79;-0.30) BB- 57.91* <0.001 −0.77 (−0.98;-0.56) CC- 12.2* < 0.001 −0.35 (−0.55;-0.16) BB- 36.56* <0.001 −0.66 (−0.88;-0.45) CC- 15.96* <0.001 −0.47 (−0.69;-0.24) BB-
G3 3.85* <0.001 0.38 (0.04;0.72) BB+ 19.01* <0.001 −0.62 (−0.91;-0.34) CC- 8.58* < 0.001 −0.39 (−0.64;-0.14) BB- 13.56* <0.001 −0.49 (−0.75;-0.24) BB- 0.65 0.42 −0.08 (−0.33;0.17) AA
G4 0.13 0.72 0.08 (−0.15;0.31) AA 4.52 0.03 −0.21 (−0.38;-0.03) AA 3.84 0.05 −0.15 (−0.34;0.03) AA 5.85 0.02 −0.26 (−0.42;-0.10) AA 0.96 0.33 −0.08 (−0.25;0.09) AA
G5 0.29 0.59 −0.10 (−0.37;0.17) AA 7.32 0.01 −0.35 (−0.57;-0.14) BB- 4.11 0.04 0.07 (−0.13;0.27) AA 2.01 0.16 −0.15 (−0.36;0.06) AA 21.1* <0.001 −0.43 (−0.63;-0.23) BB-
G6 6.72 0.01 −0.42 (−0.71;-0.14) BB- 96.09* <0.001 −1.56 (−1.88;-1.24) CC- 12.62* < 0.001 −0.44 (−0.68;-0.20) BB- 43.1* < 0.001 −0.96 (−1.24;-0.67) CC- 101.6* <0.001 −1.42 (−1.70;-1.13) CC-
G7 7.99* <0.001 −0.35 (−0.56;-0.14) BB- 14.83* <0.001 0.33 (0.14;0.52) BB+ 0.05 0.82 −0.08 (−0.30;0.14) AA 9.06* < 0.001 0.28 (0.10;0.46) AA 4.75 0.03 0.21 (0.01;0.40) AA
G8 0.38 0.54 −0.06 (−0.27;0.14) AA 0.24 0.63 0.01 (−0.19;0.20) AA 19.24* < 0.001 −0.40 (−0.61;-0.19) BB- 1.22 0.27 0.15 (−0.03;0.33) AA 1.95 0.16 −0.12 (−0.30;0.06) AA
G9 12.25* <0.001 0.47 (0.19;0.74) BB+ 0.45 0.5 −0.09 (−0.29;0.11) AA 4.92 0.03 −0.30 (−0.49;-0.10) AA 0.42 0.52 −0.07 (−0.29;0.15) AA 24.13* <0.001 0.55 (0.33;0.76) BB+
G10 12.43* <0.001 0.62 (0.32;0.93) CC+ 51.21* <0.001 0.81 (0.59;1.03) CC+ 24.08* < 0.001 0.54 (0.35;0.72) BB+ 35.63* < 0.001 0.63 (0.42;0.84) CC+ 21.37* <0.001 0.47 (0.25;0.69) BB+
G11 0.03 0.86 0.00 (−0.20;0.20) AA 38.47* <0.001 0.64 (0.43;0.86) CC+ 0.37 0.54 −0.02 (−0.19;0.15) AA 1.68 0.19 0.13 (−0.05;0.31) AA 12.14* <0.001 0.30 (0.12;0.48) BB+
G12 3.91 0.05 0.24 (0.01;0.48) AA 16.84* <0.001 0.44 (0.21;0.66) BB+ 8.07* < 0.001 0.28 (0.08;0.49) AA 44.49* < 0.001 0.76 (0.54;0.98) CC+ 17.92* <0.001 0.40 (0.19;0.62) BB+
G13 0.03 0.86 −0.12 (−0.32;0.08) AA 46.14* <0.001 0.61 (0.43;0.79) CC+ 19.82* < 0.001 0.32 (0.14;0.50) BB+ 4.2 0.04 0.16 (−0.02;0.35) AA 16.89* <0.001 0.34 (0.16;0.52) BB+
G14 1.73 0.19 −0.22 (−0.49;0.05) AA 27.31* <0.001 0.60 (0.39;0.81) CC+ 20.86* < 0.001 0.48 (0.29;0.67) BB+ 8.34* < 0.001 0.31 (0.10;0.53) BB+ 20.34* <0.001 0.40 (0.21;0.58) BB+
G15 6.35 0.01 −0.29 (−0.54;-0.04) AA 8.39* <0.001 0.27 (0.08;0.46) AA 2.91 0.09 0.19 (0.01;0.37) AA 8.29* < 0.001 0.28 (0.08;0.48) AA 0.04 0.84 −0.01 (−0.18;0.17) AA
G16 7.97* <0.001 −0.40 (−0.69;-0.11) BB- 9.45* <0.001 −0.31 (−0.51;-0.10) BB- 8.93* < 0.001 −0.21 (−0.39;-0.03) AA 6.01 0.01 −0.27 (−0.50;-0.04) AA 31.17* <0.001 −0.56 (−0.77;-0.35) BB-

* Bonferroni Corrected p <0 .0017; E.S.: Effect Size; Chi-sq: Chi Square.

Khan et al.

Khan et al. BMC Psychology 2013 1:5   doi:10.1186/2050-7283-1-5

Open Data