Table 3.

Modeling results for case response time

Variables	Model 1 IRR (95% CI)	Model 2 IRR (95% CI)
Time (days)	1.000 (0.999–1.000)	1.000 (0.999–1.000)
Sine (time)	0.924 (0.876–0.975)**	0.932 (0.881–0.986)*
Cosine (time)	1.591 (1.479–1.710)**	1.592 (1.480–1.713)**
Reported cases	–	1.004 (0.994–1.013)
Constant	7.987 (6.697–9.526)**	7.870 (6.579–9.414)**

CI = confidence interval; IRR = incidence rate ratios. Output presented are IRR, with values in parentheses being the 95% CI. Asterisks indicate that the variables are statistically significant: * = at the 0.05 level and ** = at the 0.01 level of significance. Note: constant here refers to the intercept, or the response time at the beginning of the time series.