Table 2 Odds ratios (ORs) with corresponding 95% confidence intervals (CIs) for covering the observed number of cases in the period 1993–97 with the prediction intervals calculated from trends up to 1987.

Country

< 0.001

0.39

   Denmark

1.00

Reference

1.00

Reference

   Finland

1.35

0.56 – 3.2

1.18

0.47 – 2.9

   Iceland

8.54

2.8 – 26.3

1.72

0.39 – 7.6

   Norway

1.22

0.51 – 2.9

1.08

0.43 – 2.7

   Sweden

0.41

0.16 – 1.1

0.49

0.18 – 1.3

Log(frequency)^§

0.52

0.41 – 0.66

< 0.001

0.60

0.44 – 0.83

0.02