Table 12: Differential Item Functioning (DIF) for SF-36 physical health scale Rasch analysis for six waves of data collection based on marital status and area of residence.

Wave 1Wave 2 Wave 3
Marital statusUrban and RegionalMarital statusUrban and RegionalMarital statusUrban and Regional
SF36 ITEM
No.
SUM DIF
CHI-SQUARE (DIF = 2)
PROB.DIF CONTRASTMantel- Haenszel ProbabilitySUM DIF
CHI-SQUARE (DIF = 2)
PROBDIF CONTRASTMantel- Haenszel ProbabilitySUM DIF
CHI-SQUARE (DIF = 2)
PROBDIF CONTRASTMantel- Haenszel Probability

1:Q113.250.00.6391.62.4420.14.7130.41.8160.00.185
3:Q3A5.79.0540.00.7251.27.5270.00.3305.69.0570.00.073
4:Q3B1.94.3760.00.0690.56.7540.15.8350.50.7790.06
5:Q3C1.84.3940.060.03.9840.000.56.7560.00.442
6:Q3D0.97.6140.00.9472.13.342-0.20.7780.44.8040.00.700
7:Q3E0.41.8160.00.2872.75.2500.00.1531.26.5290.00.143
8:Q3F0.06.9700.00.6840.18.917-0.08.5990.03.988-0.04.964
9:Q3G13.16-0.02.0761.33.5120.030.57.7500.00.847
10:Q3H12.780.00.3245.72.056-0.22.3200.02.9900.00.225
11:Q3I7.450.00.3575.55.0610.070.001.0000.00.631
12:Q3J0.95.6200.00.3060.03.988-0.03.8360.73.6930.00.251
13:Q4A2.34.3060.00.5190.08.9620.00.4610.17.9190.00.360
14:Q4B1.45.4810.00.7824.22.119-0.30.2066.610.00.520
15:Q4C2.47.2880.00.9820.08.9610.00.2400.37.8310.00.524
16:Q4D0.08.9650.00.8450.06.9730.00.8734.54.1010.00.053
21:Q72.54.277-0.059.340.00.1310.13.9410.00.145
22:Q837.290.00.1141.00.605-0.09.6511.85.3940.02.081
33:Q11A27.30.071.11.5720.00.5210.02.9900.00.275
34:Q11B36.380.00.9051.41.490-0.20.3096.660.00.170
35:Q11C12.20.00.2040.68.7100.00.9630.58.749-0.05
36:Q11D35.29-0.051.38.5000.12.4447.030.00.724

Wave 4Wave 5Wave 6
Marital status Urban and RegionalMarital statusUrban and RegionalMarital statusUrban and Regional
SF36 ITEM
No.
SUM DIF
CHI-SQUARE (DIF = 2)
PROBDIF CONTRASTMantel- Haenszel ProbabilitySUM DIF
CHI-SQUARE (DIF = 2)
PROBDIF CONTRASTMantel- Haenszel ProbabilitySUM DIF
CHI-SQUARE (DIF = 2)
PROBDIF CONTRASTMantel- Haenszel Probability

1:Q10.67.7140.00.1854.44.1070.23.7072.87.2350.09.418
3:Q3A0.22.8970.00.0731.32.5150.00.3753.73.1530.00.176
4:Q3B0.26.8780.060.59.7440.34.2292.71.2540.38.098
5:Q3C3.48.1730.00.4420.65.7200.00.3421.81.400-0.13.270
6:Q3D1.39.4960.00.7002.83.240-0.16.5737.850.00.761
7:Q3E0.10.9530.00.1431.73.4180.03.026.170.00.278
8:Q3F2.31.311-0.04.9640.001.000-0.17.4560.43.808-0.08.248
9:Q3G0.95.6210.00.8470.39.8240.121.20.5470.11
10:Q3H1.89.3840.00.2250.73.695-0.26.4430.68.712-0.12.739
11:Q3I0.001.0000.00.6310.42.8090.00.9610.55.7610.00.387
12:Q3J0.05.9750.00.2510.10.9530.06.2520.65.722-0.03.664
13:Q4A0.45.7980.00.3600.001.000-0.060.17.922-0.07.282
14:Q4B1.60.4470.00.5201.98.367-0.05.8610.82.663-0.12.138
15:Q4C2.50.2830.00.5240.01.9960.00.4530.20.9080.00.255
16:Q4D0.68.7110.00.0530.24.889-0.06.7330.73.6920.02.431
21:Q73.61.1620.00.1450.001.000-0.06.4131.75.413-0.07.650
22:Q81.03.5950.02.0813.03.2170.00.3104.23.119-0.10.644
33:Q11A0.14.9340.00.27513.77-0.05.1701.34.509-0.07.729
34:Q11B4.03.1310.00.1701.80.4030.202.28.3170.07.252
35:Q11C0.001.000-0.050.49.7830.00.2803.68.1560.00.681
36:Q11D0.37.8310.00.7247.48.020.00.9411.55.457-0.03.897

Notes. PROB. = probability; ; p ≤ .01; p ≤ .001.