From: Item reduction and validation of the Chinese version of diabetes quality-of-life measure (DQOL)
Item No. | Step 1. EFA | Step 2. IRT | ||
---|---|---|---|---|
Factor 1 | Factor 2 | Discrimination | Item information functionb | |
Factor loading< 0.3a | < 1a | < 0.5a | ||
1 | 0.356 | 0.421c | 2.830 | > 2, < 2.5 |
2 | 0.313 | 0.405c | 2.848 | > 2, < 2.5 |
3 | 0.342 | 0.407c | 3.496 | > 3, < 3.5 |
4 | 0.357 | 0.368c | 1.987 | > 1, < 1.5 |
5 | 0.361c | 0.248 | 0.778 | < 0.2 |
6 | 0.506c | 0.115 | 1.097 | < 0.4 |
7 | 0.274 | 0.181 | Removed | |
8 | 0.369c | 0.258 | 0.769 | < 0.2 |
9 | 0.427c | 0.203 | 1.024 | < 0.3 |
10 | 0.343c | 0.153 | 0.768 | < 0.2 |
11 | 0.470c | 0.160 | 1.211 | < 0.5 |
12 | 0.365c | 0.184 | 0.854 | < 0.3 |
13 | 0.373c | 0.171 | 0.884 | < 0.3 |
14 | 0.466c | 0.218 | 1.147 | < 0.4 |
15 | 0.544c | 0.207 | 1.485 | > 0.6, < 0.7 |
16 | 0.544c | 0.045 | 1.328 | > 0.5, < 0.6 |
17 | 0.456c | −0.128 | 1.237 | < 0.5 |
18 | 0.368c | 0.077 | 0.801 | < 0.2 |
19 | 0.494c | 0.186 | 1.178 | < 0.5 |
20 | 0.592c | 0.031 | 1.567 | < 0.5 |
21 | 0.394c | 0.205 | 0.850 | < 0.3 |
22 | 0.491c | −0.063 | 1.506 | > 0.6, < 0.7 |
23 | 0.220 | −0.023 | Removed | |
24 | 0.352c | 0.068 | 0.793 | < 0.2 |
25 | 0.404c | −0.076 | 0.991 | < 0.3 |
26 | 0.262 | −0.150 | Removed | |
27 | 0.485c | −0.052 | 1.429 | > 0.6, < 0.7 |
28 | 0.519c | −0.041 | 1.517 | > 0.7, < 0.8 |
29 | 0.173 | −0.059 | Removed | |
30 | 0.575c | −0.087 | 1.666 | > 0.8, < 0.9 |
31 | 0.212 | −0.017 | Removed | |
32 | 0.346c | −0.242 | 0.998 | < 0.3 |
33 | 0.345c | 0.042 | 0.762 | < 0.2 |
34 | 0.271 | −0.060 | Removed | |
35 | 0.214 | −0.197 | Removed | |
36 | 0.383c | −0.351 | 1.068 | < 0.4 |
37 | 0.449c | −0.162 | 1.099 | < 0.4 |
38 | 0.410 | −0.514c | 0.321 | around 0 |
39 | 0.403 | −0.441c | 0.303 | around 0 |
40 | 0.330 | −0.461c | 0.360 | around 0 |
41 | 0.372 | −0.510c | 0.289 | around 0 |
42 | 0.433c | −0.182 | 1.224 | < 0.5 |
43 | 0.526c | −0.089 | 1.357 | > 0.5, < 0.6 |
44 | 0.450c | −0.180 | 1.306 | > 0.5, < 0.6 |
45 | 0.479c | 0.021 | 1.048 | < 0.4 |
46 | 0.465c | −0.280 | 1.515 | > 0.7, < 0.8 |