Variable | Chi-square (DF) | Rate ratio | 95 % CI | p-value |
---|---|---|---|---|
Season | 12.5 (3) | 0.0059 | ||
Summer | 0.99 | 0.93–1.05 | 0.6748 | |
Autumn | 1.03 | 0.96–1.10 | 0.3674 | |
Winter | 1.07 | 1.02–1.12 | 0.0047 | |
Spring | 1 (reference) | |||
Mandatory | 6.5 (1) | 1.17 | 1.04–1.31 | 0.0107 |
Year | 14.9 (1) | 1.14 | 1.09–1.20 | <0.0001 |
Mandatory Yeara | 74.3 (1) | 0.70 | 0.64–0.76 | <0.0001 |
Year (before)b | 1.14 | 1.09–1.20 | <0.0001 | |
Year (after)b | 0.80 | 0.76–0.83 | <0.0001 |