Table 5

Differential item functioning positive and negative symptoms: reference group = USA vs. focal group = India and East & Maritime Asia
India Eastern Asia
Item Chi-sq p-value E.S. (95% C.I.) Class India Chi-sq p-value E.S. (95% C.I.) Class Eastern Asia USA Mean
P1 2.4 0.12 −0.15 (−0.32;0.02) A 4.19 (0.99) 7.55 0.01 −0.32 (−0.52;-0.13) BB- 3.89 (1.01) 4.29 (1.05)
P2 0.01 0.94 0.06 (−0.17;0.29) A 3.46 (1.32) 1.72 0.19 0.29 (0.06;0.52) AA 3.52 (1.81) 3.42 (1.34)
P3 8.78 < 0.001 0.25 (0.10;0.40) A 4.53 (0.96)* 0.01 0.94 −0.03 (−0.23;0.17) AA 4.06 (1.18) 4.33 (0.96)
P4 0.39 0.53 −0.07 (−0.22;0.07) A 2.55 (1.18) 6.78 0.01 0.19 ( 0.03;0.36) AA 2.43 (1.12) 2.70 (1.80)
P5 2.62 0.11 −0.16 (−0.34;0.02) A 3.08 (1.70) 7.27 0.01 −0.28 (−0.49;-0.06) AA 2.47 (1.65) 3.34 (1.33)
P6 19.93 < 0.001 −0.37 (−0.53;-0.21) B- 4.25 (0.78)* 5.77 0.02 −0.29 (−0.46;-0.11) AA 4.16 (0.87) 4.64 (1.02)
P7 22.91 < 0.001 0.44 (0.26;0.61) B+ 3.39 (0.86)* 14.21 < 0.001 0.43 (0.23;0.64) BB+ 3.07 (1.06)* 3.05 (1.26)
N1 7.86 0.01 −0.20 (−0.34;-0.06) AA 4.05 (1.50) 0.09 0.76 0.09 (−0.06;0.24) AA 3.85 (1.66) 4.01 (1.67)
N2 0.02 0.9 0.01 (−0.09;0.12) AA 3.85 (0.77) 0.59 0.44 −0.10 (−0.21;0.01) AA 3.65 (0.69) 3.85 (0.79)
N3 15.16 < 0.001 0.31 (0.17;0.45) BB+ 3.66 (1.41)* 3.45 0.06 0.16 (0.01;0.30) AA 3.00 (1.29) 3.26 (1.51)
N4 8.98 < 0.001 −0.23 (−0.37;-0.09) AA 3.55 (1.01)* 4.91 0.03 −0.16 (−0.29;-0.04) AA 3.34 (0.77) 3.74 (1.23)
N5 2 0.16 −0.15 (−0.33;0.03) AA 4.14 (1.23) 1.57 0.21 −0.12 (−0.31;0.06) AA 3.83 (1.41) 4.16 (1.32)
N6 13.42 < 0.001 0.29 (0.13;0.44) AA 4.06 (1.62)* 0 0.98 −0.01 (−0.16;0.14) AA 3.24 (1.33) 3.52 (1.73)
N7 0.02 0.88 −0.03 (−0.22;0.17) AA 2.89 (1.21) 2.81 0.09 0.15 (−0.02;0.33) AA 2.88 (1.83) 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