Table 5 The total variance explained by shorter versions of the Finnish method in comparison to the full Finnish method
Number of occasions used to estimate frequency of drinking | |||||
|---|---|---|---|---|---|
1 (%) | 2 (%) | 3 (%) | 4 (%) | ||
Number of occasions used to estimate quantity per drinking occasion | 1 | 95.9 | 95.9 | 96.1 | 96.6 |
2 | 98.6 | 98.6 | 98.8 | 99.7 | |
3 | 98.6 | 98.6 | 98.8 | 99.6 | |
4 | 98.8 | 98.8 | 99.0 | 100.0 | |