Table 6: Differential Item Functioning (DIF) for SF-36 total scale Rasch analysis for six waves of data collection based on marital status and area of residence.

WAVE 1WAVE 2Wave 3
Marital statusUrban and RegionalMarital statusUrban and RegionalMarital statusUrban and Regional
ITEMSUMMARY DIFPROB.DIF CONTRASTMantel- Haenszel ProbabilitySUMMARY DIFPROB.DIF CONTRASTMantel- Haenszel ProbabilitySUMMARY DIFPROB.DIF CONTRASTMantel- Haenszel Probability
No.CHI-SQUARE (DIF=2)CHI-SQUARE (DIF=2)CHI-SQUARE (DIF=2)

18.680.00.9241.78.4070.19.4520.25.8820.00.861
23.17.2020.00.2950.55.7600.00.7910.14.9360.00.134
34.95.0830.00.8110.21.9030.20.3265.47.0640.00.907
40.87.6470.00.4920.44.8040.000.34.8470.00.438
50.89.6400.050.09.959-0.14.9830.40.8180.02
60.47.7920.00.1424.67.0950.00.2880.57.7500.00.619
70.06.9710.00.6872.94.227-0.01.8001.39.496-0.02.054
80.32.8550.00.3620.27.8750.020.06.9740.00.243
913.66-0.062.06.354-0.14.6030.70.704-0.06.072
1011.27.000.007.040.060.001.000-0.06
113.41.1790.00.0716.250.04.5030.001.0000.00.473
120.16.9260.00.9060.10.9520.00.9810.69.7060.00.722
132.93.2270.00.8450.09.959-0.19.4740.04.9820.00.159
140.96.6180.00.3273.10.2100.00.8226.13-0.05.126
152.37.3030.00.3660.06.9700.07.6600.38.8280.00.815
160.001.0000.00.5910.05.9760.00.3584.14.1240.00.317
171.80.4040.00.5810.10.952-0.02.9560.03.9870.00.475
183.78.1490.00.7040.52.770-0.02.2380.62.7310.00.571
191.54.4600.00.8920.23.893-0.10.8360.06.9710.00.882
2055.71.00-0.07.0367.620.00.5260.06.9700.00.088
213.24.195-0.06.011.17.5540.15.0870.001.0000.00.784
2233.920.00.2394.09.1270.00.6611.52.4650.03.649
237.120.00.1002.90.231-0.06.4360.18.9160.00.498
2423.590.110.12.9420.00.99313.400.00.106
2564.840.1530.23-0.38.0990.01.9970.07
2610.47-0.072.13.3410.00.51228.34-0.07
2713.710.00.7789.09-0.07.9240.85.6510.00.914
2818.730.1018.700.00.5900.79.6710.05
299.310.0010.32-0.43.21413.340.00.720
3014.58-0.0614.570.00.4033.83.145-0.07
317.380.021.40.493-0.23.6872.57.2730.00.108
3218.090.000.65.7200.00.9086.310.00.422
3315.010.020.40.820-0.14.5410.001.0000.02
3430.390.00.9631.61.4430.00.9376.570.00.823
359.620.00.6060.37.833-0.26.2840.31.8590.02
3629.49-0.061.11.5710.00.3575.88.052-0.02

Wave 4Wave 5Wave 6
Marital statusUrban and RegionalMarital statusUrban and RegionalMarital statusUrban and Regional
ITEMSUMMARY DIFPROB.DIF CONTRASTMantel- Haenszel ProbabilitySUMMARY DIFPROB.DIF CONTRASTMantel- Haenszel ProbabilitySUMMARY DIFPROB.DIF CONTRASTMantel- Haenszel Probability
No.CHI-SQUARE (DIF=2)CHI-SQUARE (DIF=2)CHI-SQUARE (DIF=2)

10.22.8980.00.2614.26.1170.14.7691.14.5600.11.198
20.35.8410.002.92.2290.00.9760.15.9300.00.275
30.25.8820.00.0782.24.323-0.02.4035.55.0600.00.613
40.03.9870.00.1451.97.3690.00.7564.67.1000.00.027
50.66.7160.060.46.7950.27.6181.40.4900.43.083
66.420.00.5555.78.0540.00.27111.47-0.14.427
72.74.2510.00.7054.04.130-0.20.5748.640.04.948
81.19.5490.00.1650.87.6450.051.17.5600.00.117
94.04.130-0.04.9981.92.379-0.20.3713.26.190-0.04.752
101.85.3920.00.8942.52.2800.112.21.3300.10
113.41.1790.00.1862.23.324-0.31.8231.92.380-0.08.821
120.08.9650.00.3940.001.000-0.02.5981.52.4600.00.357
130.16.9270.00.2140.01.9980.01.6491.11.570-0.04.916
140.03.9860.00.3681.12.569-0.061.21.540-0.07.274
153.06.2140.00.6110.001.000-0.06.8600.86.650-0.09.225
162.99.2210.00.5781.01.6020.00.8331.66.4300.00.499
170.57.7530.00.4751.03.594-0.10.7540.64.7300.05.290
180.08.9610.00.6714.27.116-0.07.2100.13.940-0.08.987
190.11.9470.00.4202.78.246-0.08.8280.19.910-0.08.986
200.36.8370.00.0895.27.070-0.05.1204.98.080-0.07.758
211.67.4300.00.1691.16.5560.10.4390.21.9000.10
220.54.7620.002.89.2330.00.4461.95.3700.00.874
2321.23.000.070.50.777-0.07.4421.02.6000.00.409
240.63.7300.00.14322.800.00.8976.77.030.02.084
2513.680.00.09811.590.00.6381.33.510-0.06.169
260.41.8170.008.240.02.2741.17.550-0.03.566
270.48.7870.00.1631.40.4940.22.3234.61.1000.18.521
289.620.00.8903.16.203-0.07.1090.04.980-0.11.169
290.05.979-0.064.42.1080.30.1612.07.3500.30.104
302.04.3570.006.850.00.8591.79.4000.00.517
310.47.7890.00.0686.880.33.1650.001.0000.12.985
320.16.9230.00.4772.37.3020.00.4780.07.970-0.05.889
333.33.1860.00.1805.40.0660.05.8510.45.800-0.20
340.001.000-0.031.00.6050.00.4770.49.7800.00.999
350.001.000-0.04.8080.54.7640.27.2172.08.350-0.21
362.74.2510.00.0655.82.0540.00.4951.44.480-0.03.508

Notes. PROB. = probability; ; ; .