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Table 2 Item parameters, item fit index, differential item function and effect size for the Swedish translated item banks: PROMIS Pediatric Pain Interference v.2.0., PROMIS Pediatric Fatigue v.2.0., and PROMIS Pediatric Physical Activity v.1.0

From: Psychometrics of three Swedish physical pediatric item banks from the Patient-Reported Outcomes Measurement Information System (PROMIS)®: pain interference, fatigue, and physical activity

Swedish translated Items Item parameters SS X2 itemfit index Differential item functioning
Gender SS X2 fit index Age SS X2 fit index Language SS X2 fit index McFadden R2 uniform1 effect size
Pain interference a b1 b2 b3 b4 p-value Chisq df p-value Chisq df p-value Chisq df p-value Age Gender Language
It was hard to do things with my family because I had pain 3.38 1.32 1.93 2.58 3.03 1.000 7.87 5 .163 1.30 5 .934 17.36 5 .004 .00 .00 .00
It was hard for me to be away from home because I had pain 3.30 1.12 1.76 2.61 3.28 1.000 8.73 5 .121 3.35 5 .647 28.11 5 .000 .00 .00 .00
It was hard to have fun with friends because I was in pain 3.09 1.00 1.67 2.44 3.09 1.000 2.97 5 .704 2.89 5 .716 8.27 5 .142 .00 .00 .00
It was hard to have fun when I had pain 2.96 0.70 1.29 1.98 2.60 0.998 4.46 5 .486 7.69 5 .174 4.85 5 .434 .00 .00 .00
I had so much pain I had to stop what I was doing 2.96 1.03 1.60 2.45 3.22 1.000 2.86 5 .721 4.57 5 .471 4.30 5 .507 .00 .00 .00
It was hard to stay standing when I had pain 2.92 0.91 1.52 2.24 2.88 1.000 3.74 5 .587 1.71 5 .888 4.29 5 .508 .00 .00 .00
It was hard for me to pay attention when I had pain 2.89 0.44 1.03 2.03 2.70 0.998 6.66 5 .247 8.25 5 .143 48.49 5 .000* .00 .00 .02
It was hard to get along with other people when I had pain 2.88 1.11 1.84 2.71 3.53 1.000 7.62 5 .178 8.64 5 .124 23.11 5 .000 .00 .00 .00
It was hard for me to remember things when I had pain 2.76 1.14 1.89 2.71 3.01 0.970 6.51 5 .260 1.40 5 .924 32.23 5 .000 .00 .00 .01
I had trouble doing schoolwork when I had pain 2.72 0.48 1.09 1.93 2.48 0.904 1.21 5 .944 4.47 5 .484 64.97 5 .000* .00 .00 .02
It was hard for me to walk one block when I had pain 2.72 0.98 1.63 2.49 2.99 0.987 4.99 5 .416 4.84 5 .436 18.73 5 .002 .00 .00 .00
I missed school when I had pain 2.66 1.13 1.90 3.00 3.66 0.479 9.15 5 .103 2.12 5 .832 44.88 5 .000* .00 .00 .01
I hurt a lot 2.50 0.59 1.33 2.23 2.82 0.823 5.84 5 .322 2.25 5 .813 31.81 5 .000 .00 .00 .01
I had trouble sleeping when I had pain 2.48 0.56 1.26 2.10 2.71 0.824 3.65 5 .601 5.19 5 .392 15.52 5 .008 .00 .00 .00
I needed help walking when I was in pain 2.46 1.55 2.18 3.01 3.72 1.000 4.68 5 .456 14.82 5 .011* 12.45 5 .029 .00 .00 .01
It was hard for me to run when I had pain 2.28 0.40 1.04 1.79 2.31 0.000 4.39 5 .495 5.43 5 .365 3.57 5 .613 .00 .00 .00
I walked carefully when I was in pain 2.16 0.89 1.56 2.38 2.95 0.000 2.90 5 .715 11.15 5 .048 31.71 5 .000 .00 .00 .01
I felt angry when I had pain 2.02 0.64 1.40 2.37 2.94 0.000 9.81 5 .081 8.06 5 .153 16.32 5 .006 .00 .00 .00
I hurt all over my body 1.97 0.97 1.81 2.80 3.47 0.000 9.97 5 .076 2.84 5 .724 43.08 5 .000* .00 .00 .02
My pain was so bad that I needed to take medicine to treat it 1.88 1.14 1.79 2.58 3.23 0.000 0.94 5 .967 10.92 5 .053 29.86 5 .000 .00 .01 .01
Fatigue                   
Being tired kept me from having fun 2.95 0.25 0.98 1.84 2.72 1.000 8.89 5 .114 5.53 5 .355 117.08 5 .000* .00 .00 .04
I was so tired it was hard for me to focus on my work 2.83 − 0.51 0.17 1.17 1.94 1.000 2.70 5 .746 2.45 5 .784 10.31 5 .037 .00 .00 .00
I was too tired to enjoy the things I like to do 2.74 0.01 0.69 1.67 2.55 1.000 7.05 5 .217 1.60 5 .901 2.64 5 .076 .00 .00 .00
I was so tired it was hard for me to pay attention 2.56 − 0.56 0.16 1.16 2.16 1.000 5.79 5 .328 18.58 5 .002* 9.88 5 .0.79 .01 .00 .00
I felt tired even when I had not done anything 2.55 − 0.39 0.23 1.06 1.94 1.000 6.42 5 .267 5.13 5 .401 19.45 5 .002 .00 .00 .00
Being tired made it hard for me to remember things 2.52 − 0.08 0.64 1.48 2.38 1.000 6.75 5 .240 5.42 5 .367 11.60 5 .041 .00 .00 .00
I felt too tired to spend time with my friends 2.46 − 0.02 0.84 1.82 2.68 1.000 9.41 5 .094 5.06 5 .408 3.61 5 .607 .00 .00 .00
I was too tired to do things outside 2.46 0.07 0.84 1.64 2.89 1.000 6.52 5 .259 7.93 5 .160 63.27 5 .000* .00 .00 .02
I had trouble finishing things because I was too tired 2.37 − 0.66 0.11 1.06 1.95 1.000 7.54 5 .183 9.03 5 .108 47.25 5 .000 .00 .00 .02
I had trouble starting things because I was too tired 2.30 − 0.73 − 0.03 0.88 1.83 0.997 7.16 5 .209 18.32 5 .003* 119.71 5 .000* .01 .00 .04
I was too tired to go out with my family 2.25 0.53 1.32 2.08 2.78 1.000 9.34 5 .096 4.04 5 .544 24.39 5 .000 .00 .00 .01
Being tired made it hard for me to play or go out with my friends as much as I'd like 2.11 0.06 0.81 1.76 2.60 0.200 1.12 5 .952 3.23 5 .664 26.38 5 .000 .00 .00 .01
I was too tired to read 2.09 − 0.22 0.44 1.31 2.10 0.005 10.09 5 .073 6.10 5 .296 6.56 5 .255 .00 .00 .00
Being tired made it hard for me to keep up with my schoolwork 2.07 − 0.67 0.17 1.17 2.02 0.041 1.52 5 .911 3.22 5 .667 29.90 5 .000 .00 .00 .01
I was too tired to go up and down a lot of stairs 2.06 0.62 1.33 1.99 2.59 0.996 2.65 5 .753 12.64 5 .027 108.23 5 .000* .01 .00 .05
I was too tired to eat 2.00 0.76 1.37 2.44 3.26 0.882 2.29 5 .808 4.99 5 .418 14.17 5 .013 .00 .00 .00
I was too tired to take a bath or shower 1.99 0.39 1.07 1.92 2.96 0.986 2.63 5 .756 12.80 5 .025* 8.06 5 .153 .01 .00 .00
I got tired easily 1.99 − 1.12 − 0.25 0.68 1.70 0.087 6.41 5 .268 6.56 5 .255 30.70 5 .000 .00 .00 .01
I felt weak 1.97 − 0.27 0.58 1.59 2.54 0.008 2.58 5 .765 5.02 5 .413 15.21 5 .010 .00 .00 .00
I felt more tired than usual when I woke up in the morning 1.97 − 0.51 0.25 1.25 1.97 0.402 6.54 5 .257 7.42 5 .191 3.94 5 .558 .00 .00 .00
I felt tired 1.90 − 1.32 − 0.67 0.30 1.34 0.004 3.71 5 .592 3.42 5 .635 52.90 5 .000 .00 .00 .01
I was too tired to watch television 1.88 0.45 1.21 2.33 3.25 0.935 3.20 5 .669 3.62 5 .605 8.47 5 .132 .00 .00 .00
I was too tired to do sports or exercise 1.85 − 0.28 0.58 1.47 2.06 0.000 4.72 5 .451 3.95 5 .557 10.15 5 .071 .00 .00 .00
It was hard for me to get out of bed in the morning because I was too tired 1.65 − 1.00 − 0.23 0.59 1.45 0.000 4.64 5 .461 3.89 5 .565 14.57 5 .012 .00 .00 .00
I needed to sleep during the day 1.49 − 0.22 0.52 1.51 2.18 0.000 7.85 5 .165 18.65 5 .002* 76.34 5 .000* .01 .00 .01
Physical Activity                   
How many days were you so physically active that you sweated? 3.88 − 1.30 − 0.64 0.47 1.58 1.000 1.15 5 .949 1.28 5 .940     .00 .00  
How many days did you exercise so much that you breathed hard? 3.87 − 1.08 − 0.50 0.58 1.66 1.000 7.12 5 .212 5.84 5 .323     .00 .00  
How many days did you exercise or play so hard that your body got tired? 3.67 − 1.09 − 0.47 0.72 1.82 1.000 2.00 5 .849 11.41 5 .044*     .00 .00  
How many days did you exercise or play so hard that you felt tired? 3.05 − 1.01 − 0.34 0.87 1.95 1.000 4.15 5 .529 3.32 5 .650     .01 .00  
How many days did you exercise really hard for 10 min or more? 3.01 − 0.92 − 0.25 0.82 1.92 1.000 2.45 5 .784 2.38 5 .795     .00 .00  
How many days did you exercise or play so hard that your muscles burned? 2.75 − 0.85 − 0.01 1.17 2.45 0.988 4.35 5 .500 1.46 5 .917     .01 .00  
How many days did you play sports for 10 min or more? 2.67 − 1.54 − 0.88 0.23 1.19 1.000 2.88 5 .219 3.04 5 .690     .00 .00  
How many days did you run for 10 min or more? 1.92 − 0.78 − 0.07 1.12 2.26 0.000 1.03 5 .960 7.85 5 .165     .01 .00  
On a usual day. how physically active were you? 1.60 − 2.62 − 0.96 0.12 1.93 0.000 4.67 5 .457 5.21 5 .391     .00 .00  
How many days were you physically active for 10 min or more? 1.11 − 2.96 − 1.84 − 0.18 1.00 0.000 11.32 5 .045 15.28 5 .009*     .01 .00  
  1. *p is significant after Benjamini–Hochberg correction. The scale for the item parameters is standardized, mean 0 variance 1, as is conventional for reporting IRT parameters. The order is following alpha from large to small in every subscale. 1Uniform McFadden effect size is reported and non uniform is available on request