Table 18: Differential Item Functioning (DIF) for SF-36 mental health scale Rasch analysis for six waves of data collection based on marital status and area of residence.

Wave 1Wave 2 Wave 3
Marital status Urban and Regional Marital status Urban and Regional Marital status Urban and Regional
SF36 ITEM  No.SUMMARY DIF CHI-SQUARE (DIF = 2)PROB.DIF CONTRASTMantel- Haenszel ProbabilitySUMMARY DIF  CHI-SQUARE (DIF = 2)PROB.DIF CONTRASTMantel- Haenszel ProbabilitySUMMARY DIF  CHI-SQUARE (DIF = 2)PROB.DIF CONTRASTMantel- Haenszel Probability

17:Q5A3.13.2060.00.7200.05.975-0.17.1220.07.9690.00.978
18:Q5B6.160.00.7990.41.8140.00.3470.59.7450.00.165
19:Q5C4.23.1190.00.5050.17.922-0.30.0660.79.6730.00.484
20:Q662.55-0.09.0586.620.00.0560.001.0000.00.415
23:Q9A8.450.00.1010.001.000-0.05.4980.05.9790.00.725
24:Q9B14.830.090.41.8130.00.55311.220.02.093
25:Q9C62.480.1229.940.48.0870.01.9960.07
26:Q9D9.01-0.070.16.925-0.07.47622.89-0.06
27:Q9E8.720.00.7410.49.7820.370.57.7500.00.207
28:Q9F17.180.0820.010.00.4010.73.6940.05.004
29:Q9G5.04.0790.00.7193.76.1500.5211.420.00.815
30:Q9H13.46-0.068.620.00.1763.70.155-0.07
31:Q9I1.75.4140.00.2240.51.773-0.18.3080.001.0000.00.299
32:Q1014.700.00.2070.11.9470.00.1652.75.2500.00.978

Wave 4Wave 5Wave 6
SF36 ITEM
No.
Marital statusUrban and RegionalMarital statusUrban and RegionalMarital statusUrban and Regional
SUMMARY DIF
CHI-SQUARE (DIF = 1)
PROB.DIF CONTRASTMantel- Haenszel ProbabilitySUMMARY DIF
CHI-SQUARE (DIF = 2)
PROB.DIF CONTRASTMantel- Haenszel ProbabilitySUMMARY DIF
CHI-SQUARE (DIF = 2)
PROB.DIF CONTRASTMantel- Haenszel Probability

17:Q5A0.001.0000.00.6180.07.966-0.03.9860.94.623-0.18
18:Q5B0.001.0000.00.6392.43.2940.00.3950.39.8240.00.543
19:Q5C0.001.0000.00.4970.71.7010.20.2710.59.744-0.19
20:Q60.001.0000.00.7796.37-0.02.3372.26.320-0.03.162
23:Q9A0.001.0000.00.9001.95.3730.19.2541.18.551-0.04.176
24:Q9B6.950.00.38413.760.00.7843.06.2130.00.580
25:Q9C0.001.0000.066.84-0.68.0780.77.6780.08.371
26:Q9D0.001.0000.00.54413.70-0.02.1182.06.3540.00.923
27:Q9E0.001.0000.00.5373.30.189-0.08.7201.67.4300.06.215
28:Q9F0.001.0000.00.6870.87.6440.00.8190.43.8060.00.408
29:Q9G0.001.0000.00.6940.20.9080.27.5700.63.7290.03.278
30:Q9H6.100.00.2974.86.0860.05.0650.08.9620.00.419
31:Q9I0.001.000-0.05.1121.10.5740.48.1700.04.981-0.04.664
32:Q100.001.0000.00.4141.56.4560.080.05.9790.00.434

Notes. PROB. = probability; ; ; .