Table 2 Use of variables and instruments
From: Variety in mental health research data: when does more become too much?
| Â | Number of studies used in | Number of different variables/instruments | Use per type of study | Total use | |||||
|---|---|---|---|---|---|---|---|---|---|
| Â | Â | Â | Â | Effect (N = 46) | Other (N = 46) | Â | Â | ||
Variables | Â | Â | Â | Â | Â | Â | Â | Â | Â |
| Â | 1 | 76 | 61% | 39 | 51% | 37 | 49% | 76 | 21% |
| Â | 2 | 15 | 12% | 16 | 53% | 14 | 47% | 30 | 8% |
| Â | 3 to 5 | 21 | 17% | 44 | 56% | 35 | 44% | 79 | 22% |
| Â | 6 to 10 | 9 | 7% | 43 | 65% | 23 | 35% | 66 | 18% |
| Â | >10 | 3 | 2% | 58 | 55% | 48 | 45% | 106 | 30% |
| Â | Total | 124 | 100% | 200 | 56% | 157 | 44% | 357 | 100% |
Instruments | Â | Â | Â | Â | Â | Â | Â | Â | Â |
| Â | 1 | 162 | 73% | 99 | 61% | 63 | 39% | 162 | 44% |
| Â | 2 | 34 | 15% | 41 | 60% | 27 | 40% | 68 | 19% |
| Â | 3 to 5 | 23 | 10% | 62 | 67% | 31 | 33% | 93 | 25% |
| Â | 6 to 10 | 2 | 1% | 13 | 81% | 3 | 19% | 16 | 4% |
| Â | >10 | 2 | 1% | 20 | 71% | 8 | 29% | 28 | 8% |
| Â | Total | 223 | 100% | 235 | 64% | 132 | 36% | 367 | 100% |