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Table 1 Observed Frequencies and recoding scheme for the HDCM and HDSM

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

Freq HDCM 2 HDCM 3 HDCM 4 HDSM 1 HDSM 2 HDSM 3 HDSM 4 HDSM 5
0 339 588 761 469 580 456 327 654
1 45 56 43 49 80 66 26 32
2 91 123 82 97 136 131 87 68
3 86 83 55 71 95 102 72 56
4 67 44 41 51 44 52 50 35
5 123 128 98 91 129 147 109 124
6 25 21 15 17 19 24 29 16
7 43 38 33 28 37 35 38 26
8 26 13 18 14 20 12 25 17
9 7 4 6 6 5 2 4 5
10 143 137 106 120 137 142 157 138
11 0 1 3 2 5 1 0 1
12 13 12 10 13 11 9 26 9
13 1 3 4 3 2 2 2 4
14 24 13 17 10 7 11 14 6
15 141 117 99 103 106 118 134 126
16 5 2 3 0 2 2 2 4
17 3 1 3 1 1 3 3 1
18 11 4 5 8 4 5 6 6
19 1 1 1 0 0 0 2 3
20 155 113 105 133 93 106 165 98
21 10 4 2 6 3 1 9 7
22 5 3 3 1 3 8 4 3
23 2 1 1 5 2 1 5 8
24 3 4 5 3 0 1 1 6
25 54 50 54 64 47 45 95 91
26 4 2 5 4 4 2 2 13
27 5 3 2 8 5 2 3 18
28 15 16 6 14 6 14 15 44
29 4 6 3 2 4 4 1 12
30 315 177 185 385 177 264 366 107
Missing 54 52 46 42 56 52 41 82
  1. HDCM items 2-4 = 4-item Healthy Days Core Module (HDCM 1: self-rated global health with five responses is not shown here), HDCM 2: Physical health not good, HDCM 3: Mental health not good, HDCM 4: Poor health; HDSM = 5-item Healthy Days Symptoms Module, HDSM 1: Pain limited activities, HDSM 2: Depressed, HDSM 3: Stress HDSM 4: Not enough rest, HDSM 5: Full of energy (reversed scored)