Table 5. Incidence rate ratios for active versus passive detection.

Case definition	Crude RR (ACD:PCD) (95% CI)	Season	RR stratified by season*	p-value for interaction
Primary outcome	1.32 (1.13,1.54)	Dec–May	1.03 (0.70,1.52)	0.15
		Jun–Nov	1.39 (1.18,1.63)
1	1.31 (1.17,1.47)	Dec–May	1.02 (0.83,1.25)	0.002
		Jun–Nov	1.45 (1.28,1.66)
2	1.61 (1.47,1.77)	Dec–May	1.24 (1.08,1.43)	<0.001
		Jun–Nov	1.83 (1.66,2.02)
3	1.54 (1.38,1.73)	Dec–May	1.11 (0.87,1.41)	0.001
		Jun–Nov	1.68 (1.49,1.89)
4	1.49 (1.34,1.66)	Dec–May	1.07 (0.85,1.34)	<0.001
		Jun–Nov	1.62 (1.44,1.82)
5	1.44 (1.27,1.63)	Dec–May	1.15 (0.86,1.54)	0.08
		Jun–Nov	1.52 (1.33,1.73)
6	1.30 (1.14,1.49)	Dec–May	0.94 (0.69,1.28)	0.02
		Jun–Nov	1.39 (1.15,1.66)
7	1.35 (1.13,1.62)	Dec–May	1.14 (0.72,1.79)	0.36
		Jun–Nov	1.41 (1.17,1.70)