Table 2: Analysis of deviance table for proportion person injuries of all traffic accidents. Logistic regression model with logit link function. Traffic intensity is included as background, and effect of year is modeled by using natural splines with 𝑑 𝑓 = 4 .

𝑑 𝑓 EstimateDevianceResidual 𝑑 𝑓 Residual Deviance 𝑃 ( > | 𝜒 | )

Season10.60369.73102426.95 < .0001
DST10.050.01101426.94.9347
Year40.1764.8297362.12 < .0001
Road traffic total10.017.5496354.58.0060

Interactions
Season: DST10.1011.4595343.13.0007
Season: Year4 0.4387.4591255.68 < .0001