Table 3. Unrotated factor loadings for the first factor from principal axis factor analysis of the polychoric correlation matrix of K6 items separately for past-month (P) and worst-month (W) recall periods1.
| Nervous | Hopeless | Restless | Depressed | Effort | Worthless | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P | W | P | W | P | W | P | W | P | W | P | W | |
|
| ||||||||||||
| Brazil | .80 | .82 | .85 | .88 | .78 | .81 | .90 | .92 | .81 | .85 | .84 | .85 |
| Bulgaria | .75 | .80 | .91 | .93 | .81 | .82 | .93 | .94 | .91 | .92 | .87 | .87 |
| Colombia | .75 | .76 | .83 | .85 | .81 | .82 | .87 | .88 | .87 | .88 | .90 | .91 |
| India | .86 | .93 | .97 | .96 | .82 | .81 | .88 | .86 | .43 | .50 | .84 | .89 |
| Japan | .72 | .80 | .87 | .92 | .76 | .82 | .90 | .93 | .78 | .85 | .78 | .82 |
| Lebanon | .71 | -- | .85 | -- | .81 | -- | .90 | -- | .70 | -- | .85 | -- |
| Mexico | -- | .82 | -- | .92 | -- | .90 | -- | .93 | -- | .92 | -- | .90 |
| New Zealand | .75 | .80 | .92 | .90 | .78 | .79 | .91 | .92 | .82 | .86 | .90 | .92 |
| Nigeria | .79 | -- | .87 | -- | .85 | -- | .88 | -- | .78 | -- | .84 | -- |
| People's Republic of China | ||||||||||||
| Beijing/Shanghai | .68 | -- | .85 | -- | .79 | -- | .92 | -- | .78 | -- | .82 | -- |
| Shenzhen | .80 | .79 | .87 | .87 | .76 | .77 | .85 | .86 | .73 | .78 | .79 | .80 |
| Romania | .82 | .83 | .93 | .94 | .90 | .90 | .95 | .95 | .89 | .89 | .93 | .94 |
| South Africa | .77 | -- | .87 | -- | .82 | -- | .86 | -- | .76 | -- | .85 | -- |
| Ukraine | .71 | -- | .84 | -- | .77 | -- | .86 | -- | .68 | -- | .85 | -- |
| USA | -- | .76 | -- | .89 | -- | .78 | -- | .90 | -- | .82 | -- | .89 |
| Total | .76 | .80 | .88 | .89 | .80 | .82 | .89 | .91 | .80 | .84 | .86 | .88 |
The K6 asked respondents to rate how often they felt (i) nervous, (ii) hopeless, (iii) restless or fidgety, (iv) so depressed that nothing could cheer you up, (v) that everything was an effort, and (vi) worthless over one of two recall periods: the past-month (the P columns in the table; respondents are were asked to rate how often the symptoms occurred in the 30 days before the survey) and the worst-month (the W columns in the table; respondents are asked about the 30-day period during the past 12 months when they had the most severe psychological distress). The response options, which were identical in the two recall periods, were all of the time, most of the time, some of the time, a little of the time, and none of the time. Some WMH surveys used only one of these recall periods while others used both. This is why there are missing values in some cells of the table. The results in the total row are based on analysis of pooled within-country matrices that weight countries by the number of respondents in their samples rather than by their population sizes.