Table 1.

Incidence rates of LRTIs per 100 child-years and IRRs for severe LRTI compared to non-severe LRTI in Biliran, Philippines, from March 2014 to June 2016

	0–5 months			6–11 months			First year of life (0–11 months)			Second year of life (12–23 months)			Total
LRTI classification	n	IR [95% CI]	IRR [95% CI]	n	IR [95% CI]	IRR [95% CI]	n	IR [95% CI]	IRR [95% CI]	n	IR [95% CI]	IRR [95% CI]	n	IR [95% CI]	IRR [95% CI]
Non-severe	77	44.0 [34.7–54.9]	1	63	43.2 [33.2–55.3]	1	140	43.6 [36.7–51.5]	1	93	61.1 [49.3–74.9]	1	233	49.3 [43.1–56.0]	1
Severe	45	25.7 [18.7–34.4]	0.58 [0.40–0.86]	36	24.7 [17.3–34.2]	0.57 [0.37–0.87]	81	25.2 [20.0–31.4]	0.58 [0.43–0.77]	26	17.1 [11.2–25.0]	0.28 [0.17–0.44]	107	22.6 [18.5–27.3]	0.46 [0.36–0.58]
Undefined	2	–	–	4	–	–	6	–	–	4	–	–	10	–	–
Total	124	70.8 [58.9–84.4]	–	103	70.7 [57.7–85.7]	–	227	70.7 [61.8–80.6]	–	123	80.8 [67.2–96.5]	–	350	74.0 [66.4–82.2]	–

Total LTRTI included non-severe LRTI, sever LRTI and undefined LRTI. Observed child-years were 175.2, 145.7, and 152.2 at age 0–5, 6–11, and 12–23 months, respectively

LRTI, lower respiratory tract infection; IR, incidence rate; IRR, incidence rate ratio; 95% CI, 95% confidence interval