Table 4

Differential item functioning positive and negative symptoms: reference group = USA vs. focal group = Northern European, Southern Europe and Russia & Ukraine
Northern Europe Southern Europe Russia & Ukraine USA
Item Chi-sq p-value E.S. (95% C.I.) Class Northern Europe Mean Chi-sq p-value E.S. (95% C.I.) Class Southern Europe Mean Chi-sq p-value E.S. (95% C.I.) Class Russo Europe USA Mean
P1 0.79 0.38 −0.02 (−0.21;0.17) A 4.60 (1.06) 27.73 < 0.001 −0.56 (−0.76;-0.35) B- 3.66 (0.75)* 6.06 0.01 −0.31 (−0.50;-0.12) BB- 3.86 (0.84) 4.29 (1.05)
P2 4.16 0.04 0.22 (−0.04;0.48) A 3.97 (0.99) 26.9 < 0.001 0.83 (0.56;1.10) C+ 4.05 (1.34)* 6.58 0.01 0.34 (0.12;0.55) BB+ 3.56 (0.77) 3.42 (1.34)
P3 3.93 0.05 0.12 (−0.03;0.27) A 4.79 (0.68) 4.48 0.03 0.20 (0.03;0.38) A 4.24 (0.82) 8.68 < 0.001 0.24 (0.09;0.38) AA 4.40 (0.84)* 4.33 (0.96)
P4 0.84 0.36 −0.07 (−0.26;0.12) A 3.11 (1.13) 2.55 0.11 −0.18 (−0.35;-0.01) A 2.07 (1.25) 0.42 0.52 −0.04 (−0.21;0.12) AA 2.40 (1.24) 2.70 (1.80)
P5 0.4 0.53 0.12 (−0.06;0.31) A 3.98 (1.43) 40.17 < 0.001 −0.63 (−0.83;-0.42) C- 2.10 (1.49)* 2.2 0.14 −0.04 (−0.23;0.15) AA 2.87 (1.40) 3.34 (1.33)
P6 15.42 < 0.001 −0.33 (−0.51;-0.15) B- 4.46 (0.88)* 12.95 < 0.001 −0.39 (−0.59;-0.20) B- 1.09 (0.81)* 27.12 < 0.001 −0.59 (−0.80;-0.39) BB- 3.88 (1.20)* 4.64 (1.02)
P7 0.3 0.59 −0.04 (−0.25;0.18) A 3.39 (0.93) 56.93 < 0.001 0.72 (0.53;0.91) C+ 3.32 (1.03)* 14.33 < 0.001 0.41 (0.22;0.60) BB+ 3.21 (1.13)* 3.05 (1.26)
N1 34.81 <0.001 −0.56 (−0.76;-0.36) BB- 3.91 (1.30)* 1.89 0.17 −0.09 (−0.24;0.05) AA 4.46 (1.29) 0.4 0.53 −0.03 (−0.26;0.19) AA 4.10 (1.09) 4.01 (1.67)
N2 0.6 0.44 0.07 (−0.05;0.20) AA 3.94 (0.55) 0.46 0.5 0.03 (−0.07;0.12) AA 4.02 (0.61) 0.48 0.49 −0.08 (−0.22;0.06) AA 3.63 (0.76) 3.85 (0.79)
N3 1 0.32 0.10 (−0.08;0.27) AA 3.56 (1.30) 30.61 < 0.001 0.44 (0.29;0.59) BB+ 4.04 (1.23)* 7.54 0.01 0.20 (0.05;0.34) AA 3.24 (0.85) 3.26 (1.51)
N4 0.01 0.93 0.01 (−0.16;0.17) AA 3.84 (0.99) 37.25 < 0.001 −0.55 (−0.70;-0.39) BB- 3.49 (0.84)* 2.27 0.13 0.02 (−0.15;0.19) AA 3.52 (0.87) 3.74 (1.23)
N5 0.03 0.86 −0.03 (−0.23;0.18) AA 4.41 (1.14) 15.71 < 0.001 −0.36 (−0.55;-0.18) BB- 4.04 (1.07)* 7.78 0.01 −0.24 (−0.44;-0.04) AA 3.94 (0.94) 4.16 (1.32)
N6 0.93 0.33 0.06 (−0.12;0.24) AA 3.99 (1.39) 20.58 < 0.001 0.36 (0.20;0.51) BB+ 4.39 (1.30)* 9.07 < 0.001 0.02 (−0.17;0.21) AA 3.54 (1.08)* 3.52 (1.73)
N7 10.44 <0.001 0.35 (0.15;0.56) BB+ 3.25 (0.86)* 2.44 0.12 0.18 (−0.00;0.37) AA 3.21 (0.99) 0.33 0.57 0.11 (−0.06;0.29) AA 2.89 (0.77) 2.17 (1.15)

* 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