Table 2.

Changes in the TF incidence rate level and trend and association with the interventions

Study segments	Point change in level	Level at segment onset TF incidence rate per 105	Change in slope in the segment	Slope in segment
Pre-epidemic	−6.62*	132.6	*	−0.17
[95% CI]	[−6.99, −6.23]	[66.29, 198.91]	–	[−0.29, 0.06]
Epidemic	0.36	56.42	0.28	0.11
[95% CI]	[−0.03, 0.73]	[35.82, 77.02]	[0.15, 0.4]	[0.06, 0.15]
Intervention 1	−0.71	232.82	−0.22	−0.11
[95% CI]	[−1.05, −0.36]	[167.63, 298.01]	[−0.28, −0.15]	[−0.17, −0.06]
Intervention 2	−1.48	47.13	−0.03	−0.14
[95% CI]	[−1.78, −1.17]	[32.52, 61.74]	[−0.09, 0.03]	[−0.17, −0.12]

CI = confidence interval; TF = typhoid fever. Metropolitan region of Chile, 1969–2012.

^*Initial intercept.