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Table 3 Reduced NHP version obtained through Rasch Analysis: the NHP22

From: Classical test theory versus Rasch analysis for quality of life questionnaire reduction

PHYSICAL SCALE
ITEMS ANCHORED MEASURE SE INFIT MNSQ OUTFIT MNSQ
PM3-UNABLE TO WALK 76.1 .62 .82 .96
PM1-WALKING LIMITED 64.1 .51 1.03 1.35
P2-AWFUL PAIN 59.7 .47 .89 .92
PM6-HARD TO DRESS 55.7 .45 .83 .72
P8-PAIN SITTING 53.1 .44 .93 .90
PM5-HARD TO REACH 47.5 .42 .83 .74
EN3-OUT OF ENERGY 44.7 .41 .99 .99
P3-CHANGE PAIN 41.5 .41 .96 .97
P4-WALK PAIN 39.1 .41 .92 .91
PM2-HARD TO BEND 34.8 .41 .90 .93
PM4-STAIRS HARD 25.2 .43 .99 1.50
PSYCHOLOGICAL SCALE
ITEMS ANCHORED MEASURE SE INFIT MNSQ OUTFIT MNSQ
SO5-PEOPLE HARD 68.6 .55 1.00 1.17
SO2-CONTACT HARD 60.6 .48 .96 1.03
SO4-I'M A BURDEN 58.6 .46 .98 1.02
EM4-DAYS DRAG 56.1 .44 .90 .89
EM6-NO CONTROL 55.0 .44 .90 .88
EM9-DEPRESSED 48.1 .41 .86 .81
EM2-JOY FORGOTTEN 44.9 .41 1.06 1.11
SL3-CAN'T SLEEP 44.0 .40 .93 .88
SL5-SLEEPS BADLY 40.8 .40 .89 .86
SL4-SLOW TO SLEEP 39.2 .40 1.02 1.08
EM1-GETTING ME DOWN 36.8 .43 1.20 1.34