BioMed Research International / 2018 / Article / Tab 6 / Research Article
Evaluating the Longitudinal Item and Category Stability of the SF-36 Full and Summary Scales Using Rasch Analysis 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 1 WAVE 2 Wave 3 Marital status Urban and Regional Marital status Urban and Regional Marital status Urban and Regional ITEM SUMMARY DIF PROB. DIF CONTRAST Mantel- Haenszel Probability SUMMARY DIF PROB. DIF CONTRAST Mantel- Haenszel Probability SUMMARY DIF PROB. DIF CONTRAST Mantel- Haenszel Probability No. CHI-SQUARE (DIF=2) CHI-SQUARE (DIF=2) CHI-SQUARE (DIF=2) 1 8.68 0.00 .924 1.78 .407 0.19 .452 0.25 .882 0.00 .861 2 3.17 .202 0.00 .295 0.55 .760 0.00 .791 0.14 .936 0.00 .134 3 4.95 .083 0.00 .811 0.21 .903 0.20 .326 5.47 .064 0.00 .907 4 0.87 .647 0.00 .492 0.44 .804 0.00 0.34 .847 0.00 .438 5 0.89 .640 0.05 0.09 .959 -0.14 .983 0.40 .818 0.02 6 0.47 .792 0.00 .142 4.67 .095 0.00 .288 0.57 .750 0.00 .619 7 0.06 .971 0.00 .687 2.94 .227 -0.01 .800 1.39 .496 -0.02 .054 8 0.32 .855 0.00 .362 0.27 .875 0.02 0.06 .974 0.00 .243 9 13.66 -0.06 2.06 .354 -0.14 .603 0.70 .704 -0.06 .072 10 11.27 .00 0.00 7.04 0.06 0.00 1.000 -0.06 11 3.41 .179 0.00 .071 6.25 0.04 .503 0.00 1.000 0.00 .473 12 0.16 .926 0.00 .906 0.10 .952 0.00 .981 0.69 .706 0.00 .722 13 2.93 .227 0.00 .845 0.09 .959 -0.19 .474 0.04 .982 0.00 .159 14 0.96 .618 0.00 .327 3.10 .210 0.00 .822 6.13 -0.05 .126 15 2.37 .303 0.00 .366 0.06 .970 0.07 .660 0.38 .828 0.00 .815 16 0.00 1.000 0.00 .591 0.05 .976 0.00 .358 4.14 .124 0.00 .317 17 1.80 .404 0.00 .581 0.10 .952 -0.02 .956 0.03 .987 0.00 .475 18 3.78 .149 0.00 .704 0.52 .770 -0.02 .238 0.62 .731 0.00 .571 19 1.54 .460 0.00 .892 0.23 .893 -0.10 .836 0.06 .971 0.00 .882 20 55.71 .00 -0.07 .036 7.62 0.00 .526 0.06 .970 0.00 .088 21 3.24 .195 -0.06 .01 1.17 .554 0.15 .087 0.00 1.000 0.00 .784 22 33.92 0.00 .239 4.09 .127 0.00 .661 1.52 .465 0.03 .649 23 7.12 0.00 .100 2.90 .231 -0.06 .436 0.18 .916 0.00 .498 24 23.59 0.11 0.12 .942 0.00 .993 13.40 0.00 .106 25 64.84 0.15 30.23 -0.38 .099 0.01 .997 0.07 26 10.47 -0.07 2.13 .341 0.00 .512 28.34 -0.07 27 13.71 0.00 .778 9.09 -0.07 .924 0.85 .651 0.00 .914 28 18.73 0.10 18.70 0.00 .590 0.79 .671 0.05 29 9.31 0.00 10.32 -0.43 .214 13.34 0.00 .720 30 14.58 -0.06 14.57 0.00 .403 3.83 .145 -0.07 31 7.38 0.02 1.40 .493 -0.23 .687 2.57 .273 0.00 .108 32 18.09 0.00 0.65 .720 0.00 .908 6.31 0.00 .422 33 15.01 0.02 0.40 .820 -0.14 .541 0.00 1.000 0.02 34 30.39 0.00 .963 1.61 .443 0.00 .937 6.57 0.00 .823 35 9.62 0.00 .606 0.37 .833 -0.26 .284 0.31 .859 0.02 36 29.49 -0.06 1.11 .571 0.00 .357 5.88 .052 -0.02 Wave 4 Wave 5 Wave 6 Marital status Urban and Regional Marital status Urban and Regional Marital status Urban and Regional ITEM SUMMARY DIF PROB. DIF CONTRAST Mantel- Haenszel Probability SUMMARY DIF PROB. DIF CONTRAST Mantel- Haenszel Probability SUMMARY DIF PROB. DIF CONTRAST Mantel- Haenszel Probability No. CHI-SQUARE (DIF=2) CHI-SQUARE (DIF=2) CHI-SQUARE (DIF=2) 1 0.22 .898 0.00 .261 4.26 .117 0.14 .769 1.14 .560 0.11 .198 2 0.35 .841 0.00 2.92 .229 0.00 .976 0.15 .930 0.00 .275 3 0.25 .882 0.00 .078 2.24 .323 -0.02 .403 5.55 .060 0.00 .613 4 0.03 .987 0.00 .145 1.97 .369 0.00 .756 4.67 .100 0.00 .027 5 0.66 .716 0.06 0.46 .795 0.27 .618 1.40 .490 0.43 .083 6 6.42 0.00 .555 5.78 .054 0.00 .271 11.47 -0.14 .427 7 2.74 .251 0.00 .705 4.04 .130 -0.20 .574 8.64 0.04 .948 8 1.19 .549 0.00 .165 0.87 .645 0.05 1.17 .560 0.00 .117 9 4.04 .130 -0.04 .998 1.92 .379 -0.20 .371 3.26 .190 -0.04 .752 10 1.85 .392 0.00 .894 2.52 .280 0.11 2.21 .330 0.10 11 3.41 .179 0.00 .186 2.23 .324 -0.31 .823 1.92 .380 -0.08 .821 12 0.08 .965 0.00 .394 0.00 1.000 -0.02 .598 1.52 .460 0.00 .357 13 0.16 .927 0.00 .214 0.01 .998 0.01 .649 1.11 .570 -0.04 .916 14 0.03 .986 0.00 .368 1.12 .569 -0.06 1.21 .540 -0.07 .274 15 3.06 .214 0.00 .611 0.00 1.000 -0.06 .860 0.86 .650 -0.09 .225 16 2.99 .221 0.00 .578 1.01 .602 0.00 .833 1.66 .430 0.00 .499 17 0.57 .753 0.00 .475 1.03 .594 -0.10 .754 0.64 .730 0.05 .290 18 0.08 .961 0.00 .671 4.27 .116 -0.07 .210 0.13 .940 -0.08 .987 19 0.11 .947 0.00 .420 2.78 .246 -0.08 .828 0.19 .910 -0.08 .986 20 0.36 .837 0.00 .089 5.27 .070 -0.05 .120 4.98 .080 -0.07 .758 21 1.67 .430 0.00 .169 1.16 .556 0.10 .439 0.21 .900 0.10 22 0.54 .762 0.00 2.89 .233 0.00 .446 1.95 .370 0.00 .874 23 21.23 .00 0.07 0.50 .777 -0.07 .442 1.02 .600 0.00 .409 24 0.63 .730 0.00 .143 22.80 0.00 .897 6.77 .03 0.02 .084 25 13.68 0.00 .098 11.59 0.00 .638 1.33 .510 -0.06 .169 26 0.41 .817 0.00 8.24 0.02 .274 1.17 .550 -0.03 .566 27 0.48 .787 0.00 .163 1.40 .494 0.22 .323 4.61 .100 0.18 .521 28 9.62 0.00 .890 3.16 .203 -0.07 .109 0.04 .980 -0.11 .169 29 0.05 .979 -0.06 4.42 .108 0.30 .161 2.07 .350 0.30 .104 30 2.04 .357 0.00 6.85 0.00 .859 1.79 .400 0.00 .517 31 0.47 .789 0.00 .068 6.88 0.33 .165 0.00 1.000 0.12 .985 32 0.16 .923 0.00 .477 2.37 .302 0.00 .478 0.07 .970 -0.05 .889 33 3.33 .186 0.00 .180 5.40 .066 0.05 .851 0.45 .800 -0.20 34 0.00 1.000 -0.03 1.00 .605 0.00 .477 0.49 .780 0.00 .999 35 0.00 1.000 -0.04 .808 0.54 .764 0.27 .217 2.08 .350 -0.21 36 2.74 .251 0.00 .065 5.82 .054 0.00 .495 1.44 .480 -0.03 .508
Notes . PROB. = probability;
