Table 3 Spline regression analysis, Gastric perforated ulcers
Males | Females | |||
|---|---|---|---|---|
Year | Coef. | 95% Conf. interval | Coef. | 95% Conf. interval |
1975 | -0.14 | -0.41 0.13 | 0.03 | -0.19 0.25 |
1980 | 0.01 | -0.04 0.05 | 0.06 | 0.03 0.10 |
1985 | 0.01 | -0.03 0.05 | 0.04 | 0.01 0.08 |
1990 | 0.04 | -0.001 0.08 | 0.03 | -0.003 0.06 |
1995 | -0.07 | -0.1 -0.03 | -0.02 | -0.05 0.01 |
2000 | -0.08 | -0.11 -0.05 | -0.10 | -0.12 -0.07 |