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Table 2 Parameter estimates from the GRM for the CDC-Physical and Mental Health

From: Item response theory analysis of Centers for Disease Control and Prevention Health-Related Quality of Life (CDC HRQOL) items in adults with arthritis

Item description a b1 b2 b3 b4 b5 b6 b7
CDC-physical health         
HDCM 1: 2.24 −2.35 −1.05 0.12 1.51 - - -
General health
HDCM 2: 3.52 −0.98 −0.44 −0.06 0.24 0.52 0.86 1.04
Physical health not good
HDCM 4: 2.77 −0.27 0.08 0.38 0.66 0.92 1.24 1.49
Poor health
HDSM 1: 2.97 −0.74 −0.27 0.01 0.26 0.47 0.75 0.94
Pain limited activities
HDSM 5: 1.73 −2.2 −1.34 −0.97 −0.61 −0.27 0.10 0.47
Full of energya
CDC-Mental Health         
HDCM 3: 4.10 −0.47 0.01 0.34 0.64 0.89 1.18 1.4
Mental health not good
HDSM 2: 7.71 −0.44 0.05 0.38 0.67 0.89 1.13 1.32
Sad, blue, depressed
HDSM 3: 3.45 −0.71 −0.11 0.25 0.54 0.78 1.03 1.19
Worried, tense, anxious
  1. GRM graded response model, HDCM 4-item Healthy Days Core Module (# days except for HDCM 1), HDSM4 5-item Healthy Days Symptoms Module omitting the rest item (# days)
  2. aHDSM 5 Full of energy was reversed scored for all analyses