From: Item reduction and validation of the Chinese version of diabetes quality-of-life measure (DQOL)
Item No. | Step 1. Item level tests | Step 2. EFA | Step 3. Internal consistency reliability | ||||
---|---|---|---|---|---|---|---|
Missing rate (%) | Mean score | SD | Factor 1 | Factor 2 | Item-total corrected correlation coefficientb | Cronbach’s alphab | |
Missing rate > 5%a | < 1.8 or > 4.2a | < 0.67a | Factor loading < 0.3a | r < 0.3a | Increased after removea (Factor 1: 0.884 Factor 2: 0.822) | ||
1 | 0.312 | 2.081 | 0.711 | 0.384 | 0.528c | 0.667 | 0.764 |
2 | 0.277 | 2.132 | 0.693 | 0.337 | 0.519c | 0.648 | 0.772 |
3 | 0.243 | 2.078 | 0.649 | 0.357 | 0.550c | 0.695 | 0.751 |
4 | 0.104 | 2.174 | 0.725 | 0.388 | 0.448c | 0.564 | 0.811 |
5 | 0.104 | 2.653 | 0.926 | 0.394c | 0.172 | 0.348 | 0.882 |
6 | 0.069 | 3.129 | 0.994 | 0.518c | 0.015 | 0.492 | 0.879 |
7 | 0.069 | 2.563 | 0.811 | 0.297 | 0.170 | Removed | |
8 | 0.035 | 2.740 | 1.090 | 0.398c | 0.133 | 0.367 | 0.882 |
9 | 0.139 | 2.112 | 0.679 | 0.420c | 0.262 | 0.360 | 0.882 |
10 | 14.969 | 2.449 | 0.769 | Removed | |||
11 | 0.485 | 2.161 | 0.692 | 0.485c | 0.234 | 0.419 | 0.880 |
12 | 0.035 | 2.594 | 0.912 | 0.406c | 0.106 | 0.361 | 0.882 |
13 | 0.312 | 2.419 | 0.900 | 0.398c | 0.171 | 0.345 | 0.882 |
14 | 0.277 | 2.290 | 0.748 | 0.492c | 0.236 | 0.434 | 0.880 |
15 | 0.035 | 2.158 | 0.656 | 0.566c | 0.266 | 0.498 | 0.879 |
16 | 0.139 | 2.466 | 1.201 | 0.557c | −0.137 | 0.539 | 0.878 |
17 | 0.069 | 1.727 | 0.953 | 0.431c | − 0.166 | 0.415 | 0.881 |
18 | 0.035 | 2.321 | 1.072 | 0.381c | −0.068 | 0.379 | 0.882 |
19 | 0.035 | 2.556 | 1.075 | 0.534c | −0.018 | 0.520 | 0.879 |
20 | 0.069 | 2.580 | 1.223 | 0.608c | −0.165 | 0.597 | 0.877 |
21 | 0.035 | 2.631 | 1.225 | 0.423c | 0.060 | 0.396 | 0.882 |
22 | 0.069 | 1.724 | 0.892 | 0.492c | −0.124 | 0.468 | 0.880 |
23 | 0.035 | 2.729 | 1.135 | 0.230 | 0.006 | Removed | |
24 | 0.035 | 2.960 | 1.239 | 0.381c | −0.132 | 0.381 | 0.882 |
25 | 14.414 | 1.875 | 0.968 | Removed | |||
26 | 1.802 | 1.581 | 0.961 | 0.245 | −0.173 | Removed | |
27 | 0.416 | 1.790 | 1.012 | 0.487c | −0.144 | 0.451 | 0.880 |
28 | 0.104 | 1.843 | 1.047 | 0.514c | −0.152 | 0.490 | 0.879 |
29 | 0.035 | 2.445 | 1.176 | 0.185 | −0.228 | Removed | |
30 | 0.208 | 1.882 | 0.977 | 0.574c | −0.192 | 0.526 | 0.878 |
31 | 0.035 | 2.343 | 1.079 | 0.222 | −0.187 | Removed | |
32 | 0.069 | 1.297 | 0.594 | Removed | |||
33 | 0.104 | 2.499 | 1.260 | 0.355c | −0.089 | 0.342 | 0.883 |
34 | 0.035 | 1.781 | 0.945 | 0.234 | −0.029 | Removed | |
35 | 8.073 | 1.136 | 0.415 | Removed | |||
36 | 2.495 | 1.229 | 0.593 | Removed | |||
37 | 0.728 | 1.888 | 1.147 | 0.429c | −0.166 | 0.420 | 0.881 |
38 | 3.222 | 1.262 | 0.685 | 0.314c | −0.177 | 0.294 | 0.883 |
39 | 2.668 | 1.311 | 0.762 | 0.332c | −0.197 | 0.305 | 0.883 |
40 | 4.089 | 1.134 | 0.431 | Removed | |||
41 | 3.915 | 1.213 | 0.633 | Removed | |||
42 | 0.312 | 1.641 | 1.018 | 0.424c | −0.263 | 0.414 | 0.881 |
43 | 0.104 | 1.998 | 1.151 | 0.519c | −0.264 | 0.508 | 0.879 |
44 | 0.069 | 1.551 | 0.908 | 0.441c | −0.225 | 0.425 | 0.881 |
45 | 0.104 | 2.632 | 1.317 | 0.502c | −0.182 | 0.487 | 0.880 |
46 | 0.104 | 1.353 | 0.720 | 0.427c | −0.250 | 0.414 | 0.881 |